Does "No" mean "No" with regard to the VA and disability?

The kind folks who work for VA have generally been trained to DENY claims for benefits. It is any potentially disabled veteran to solicit the help of a servive officer from DAV, VFW, American Legion or other similarly oriented organization when first submitting an application for VA benefits OR when appealing any VA denials. Most applications will be denied at least twice. Sometimes three times. I left service with 10% disability; appealed and raised to 40%; appealed and raised to 90%; appealed and raised then to 100%. The struggle took 14 years total. Had I not had the professional help of a DAV service officer over the course of those years I would still be at 10%. FYI: these services are FREE via organizational service officers. The legal, commercial advocates you see advertized under various names will cost YOU 25% of any accrued back benefits to which you are entitled! Use the FREE assistance; they have a lot of cliut with VA. And you do NOT have to be a member of the organization which represents you. I am very partial in support of the Disabled Veterans of America, that being said. My benefits income went from $49 monthly to $3229 monthly due to their efforts.

No. What you do is put in an appeal and let them know why you disagree with their decision.

No it doesn't. I would locate a valuable Veterans Service Officer and reopen your claim along with any other disabilities that occurred to you in the military.

Go to va.gov. with President Trumps streamlined claim for disability it is supposed to be easier. You only have a short time to appeal and I believe your time has passed. But you can file a new claim. Ask for a c&p exam.
I was denied 4 years ago, I appealed it and have been on (old system) waiting list for 3 years. I was told it could be 5 or 6. Good news is if I win my appeal they will owe me back compensation to the date I originally filed. Dont give up.