Re enlisting into the USMC after a congressional inquiry?

Hello, I am a prior service Marine. I was discharged in 2016 after requesting to speak with a chaplain due to personal issues in my life, the chaplain recommended that I be admitted to the psych ward at Naval Hospital Camp Lejeune, I was admitted and spoke with a naval doctor who notated in my medical records that I was suicidal and had depressive and anxiety issues. That being said this is not accurate, from the time i was admitted I was given multiple drugs which left me out of my mind and in my opinion not able to accurately convey my thoughts. Ultimately however my command decided to discharge me with a RE-3P re enlistment code and those statements were placed in my records by the doctor. Ever since I was separated I have been trying to get back in as being a Marine was always my life goal and never wanted to be sent home in the first place. I have since been told by an attorney that a RE-3P code is for disabilities and should not have been placed on my DD-214. I attempted to transition to the army but The Army denied an entry waiver due to the wording of my records, but I was able to contact a Marine recruiter who is willing to help. He has told me that if i can get my RE code adjusted or have a congressional inquiry done I'd be able to be waived back into service regardless of what is stated in my records. My ultimate question with this is what i'm being told accurate and do I still have hope to serve again? I was an 18 year old kid who at the time was going through many personal issues but was still motivated to serve and I still want nothing more than to return to the fleet. I have contacted my congressman I am just waiting to hear back but I am just wondering if all my efforts are in vein, and even with a RE code adjustment would i still be able to re enlist at any point?