Why is it difficult for veterans to get the proper treatment and benefits they need?

I will try to answer the question by telling my story. And by doing so I hope to help someone who is having a hard time finding the help they need. I went to boot camp on Paris Island on October 23, 1996. I was mentally and physically healthy, but I was selfish and conceited I only thought of myself and my survival. Well took awhile for drill instructors to be, because did I mention I was stubborn. Okay I will admit that I am still stubborn. I didn't join the Marines out of a great desire to serve my country or to be a Marine. Hell I didn't know anything about the Marines. Everyone in my family served in the Army or Navy before me. In fact I had planned to go in the Army, but the wait was too long. I believed I had a child on the way, so I joined the Marine Corp as a infantry man. I graduated Boot Camp in January of 1997. I reported to infantry school in February of 1997 this is where my great career received it's first death blow. In March I injured my knee during night land navigation and lost complete use of my right leg for a few months. While being laid up with the injury I began to develop panic attacks, because they were discharging people left and right. I had no education and no prospects outside of the military at that time. So I fought to get back to full duty and after months of physical therapy I did. I regained 23% of function in my right leg which allowed me to returned to full duty, but I could not be a infantry man any more. So I became a 1141 generator operator/ electrician. Went to Court house bay in June while still going to physical therapy. My class pick up in July I was still receive physical therapy August my physical therapy ended and I had regained 50% function of my right leg. My command notice my behavior was off a placed me on suicide watch serval times, but never sent me to see a mental health specialist. To a certain degree I understand there thought process. I was young with a lot of potential to be a great Marine. While climbing a telephone pole during class I I fell from the top of the pole and landed flat footed cause me sprain my lower back. While being treated the Cpo1 that was taking BP noticed that it was high 180/110. The doctor said it was because of the pain so they let it go. I graduated from school that September and in October i arrived in Okinawa Japan. I was made emergency maintenance crew chief on Camp Schwab I wasn't the only one. But I was out of my league, but I did my best. I didn't fail but I didn't become the greatest ever. I was still suffering from severe lower back pain, knee pain, panic attacks, suicidal tendencies, high BP, and now night seizures. I would only sleep about three hours a day if I actually slept. Which wasn't bad because I got a lot of work done. After completing my tour of duty in Okinawa I was assigned to MCLB Albany Georgia. By this point all my conditions have taken a toll on my heart and I was diagnosed with a ischemia by the radiologist, but the cardiologist over road the diagnosis because of my age. So because of my weight gain due to my mental illness I was administratively separate on February 3 2000 even though I had met the metrics of the weight control program in half the time allotted. Now I was never told about my mental illness because I guess I had never been officially diagnosed. But the other medical problems i knew about. So from 2000 to 2006 the doctors tried control my BP which was always around 240/150. I filed for V.A disability for my blood pressure in 2003. The VA only awarded me 10% even though according to the rating system i was supposed to get 60%. Later that year I filed for my knee and lower back pain. I got 10% for it and later received three different diagnosis on knee and receive 10% for each. The lower back pain was denied because I was in a small fender bender that cause my pain level to increase from a five or six too a eight or nine. However the rules say that if the injury began during military service than its should be awarded. I was referred to a mental health specialist by my primary care nurse practitioner 2006 and that's when I found out about my mental illness. But the psychiatrist didn't think it was service-connected until I inform her that I had been dealing with the issues since 1998. So got a copy of my service record and my medical records for her to review. Three months later she informed me that i was 100% disabled due to my mental illness. You would think that would be the end. Nope. I filed for the disability and was awarded 10% even though the rating was 50% or 100% by rule at the time. I started my mental health treatment in 2006. In 2011 I was finally awarded 100% for my mental illness. That same year my primary care physician became concerned about my heart so he schedule me for a chemical stress test and again I was diagnosed with ischemia by the radiologist but it was once again over ridden by the cardiologist. But I had already filed for disability with the VA. So I was denied. So I filed for social security that same year and received it in 2012. According to va rules I was supposed to be reclassified are permanent and total disabled with individual unemployability. The VA attempted to down grade my disability rating to 70% in beginning in 2015. I fought back and they still downgraded the percentage but awarded permanent and total disability individual unemployability. And reduced all my other rating to zero. I was told by a recently retired employee of the VA that raters do that so the veteran can't qualify for special monthly compensation. Lat last year I was diagnosed again this time by a cardiologist with an enlarged aortic root. Caused by the persistent panic attacks and extremely high blood pressure. After all I have been through do you think the VA will be fair if I file?