If you are a veteran you can sue the VA for medical malpractice, but to do so, you need to speak to a lawyer that specializes in that type of litigation (suing someone). There is a time limit as to how long you have before it's too late to file, so you shouldn't wait very long to see a lawyer.
Law firms will talk with you concerning this matter and not charge you for the interview. If you ARE a veteran, then by law the lawyer cannot charge you more than 20% of the award --plus expenses-- if it does not go to trial, but if you HAVE to go to trial, then the lawyer can only receive 25% of what is awarded, plus expenses... Your spouse can also file against the VA with you, but I'm not sure the 20/25% applies to her, or not...
Usually law firms will not charge you anything if you lose the case.
Realistically it depends on what the disability is for, you have to consider if you are current receiving disability you are restricted from preforming certain tasks which could prevent you from preforming duties within the Army. Contact a local recruiter and find out from them. Most likely you will not be permitted to enlist unless you can prove you no longer require the disability and or will be required to give up your disability.
A nickel is worth five cents.
You hire a lawyer and you sue the medical treatment facility. Also, when did you discover possbile medical negligence? There is a time limitation. Call post or base legal office to find out limitations. The Medcial Facility will then sequester your records so no one can make changes to the record. Also, they assure the record is complete in documentation and paperwork.