How can you sue the VA hospital admin?

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.