Husband is mentally ill?

I love him but he has severe mental illness and a lot of emotional problems. He has been diagnosed with a couple different things, none which seem to really fit him and so far no therapy or medication has really helped. I have a better-than-layman's understanding of mental illness and abnormal psychology but I am also only human. He is very hard to deal with on a day to day basis; he is paranoid, he misinterprets EVERYTHING that is said to him as something bad or offensive, he has a "martyr" complex in the extreme, he misunderstands social cues and contexts and the worst part is that he is unable to see that his own behavior is the cause for the way other people react to him. He also has a whole host of emotional problems. I love him and I knew that he was mentally ill when I met him but he has just gotten worse and worse in some areas and nothing so far has helped. He has been hospitalized, been on many meds and in many different kinds of therapy. I don't want to leave him but...