I have a chronic pain and mobility problems. In my opinion, law school was harder for me than it was for a lot of my classmates. Stress and lack of sleep make me feel worse - and there's a lot of both in law school. I also found the experience a bit isolating, because I didn't feel like I really had anyone I could talk to about my health problems.
Anyway, I think having anything less than great health is a disadvantage in law school. Regardless, if you want to be a lawyer there's pretty much only one way to do it. If you want to go to law school - don't let your disability stop you.