The fact you're enduring that horrifying laundry list of horrible conditions and still managing to keep pushing forward with a good attitude is rather commendable. Seriously, loads of respect!

As for the RP question, I occasionally do like to put in mental illness with my characters, although I do my best to understand it and make it as accurate as I can without actually knowing what it's like first hand. The key for anyone doing it, I think, is to be respectful to what you're incorporating into the character and not just using it as a cheap gimmick (kind of like those idiots who pretend they have some kind of mental illness for "street cred" or a "woe is me! Pay attention!" load of horse crap.). 

So far, I have two characters who suffer from diagnosable mental conditions, one who suffers from post-traumatic stress disorder which often manifests itself as nightmares or vivid flashbacks, and it's brought on my things that remind her of what caused it. Her life kind of fell apart after her military service, her mother didn't know how to cope with this changed girl who came home, and she's been trying to get her life back on track without seeking out medical help because she's way too stubborn and prideful, to various degrees of success. She'll always suffer from it, but everyone has good days and bad days. She tries to keep herself busy and mentally stimulated so she doesn't have much time to think, which sometimes goes back to where she doesn't want to go.

The other is a sociopath, which is way too often confused with psychopath. He's incapable of assigning emotional values to people and things, and a lot of his personality is based around him acting like a goofy and aloof individual with an odd but endearing sense of humour, but it's all an act that's second nature to him because he's been doing it so long, kind of like wearing a mask so people can't see his true self. Not that he really cares what people think, it's just easier for him to do his job if people assume he's not an extremely intelligent and resourceful individual who is cold and ruthless at what he does. It's very much a wolf in sheeps clothing scenario. 

It can be a lot of fun writing those characters, and I think if you treat a mental illness as a facet of who they are rather than like I said, a gimmick or a source of cheap drama, it can be very powerful and captivating to read and write.