Personally, I don't think anyone can tell you there's something wrong with you or your relationship. Every relationship is unique in that only you two are in your shoes and until someone can feel what you feel and experience it from your point of view it seems they have no right to tell you what to do. That being said it seems like you're thinking quite clearly and logically. Like you said it is possible you are not grasping the severity of each others disorders but it seems to me that just by asking yourself that question it proves you are fully aware. Every relationship has its ups and downs. It seems like you truly care about him which is great but keep in mind that you come first. If he is being distant to the point where you are having more bad moments than good in the relationship it's not likely to get any better.
I would give it another try but try communicating in a different way or setting. For example, if you usually try to talk to him after work, this time try at a different time of the day when you are both relaxed? Also it helps to start your conversations with "I ...." rather than " You are making me /this/ etc...). Remind him that you're in this together and mention a few things about your relationship that make you smile. Hopefully he will open up or agree with you that he wants to make this work just as much as you do, just keep in mind that your health comes before anoything else. If the effort continues to be one-sided it might be time to reconsider your options because you sound like a genuinely good, caring person and you deserve to have a good guy who's willing to meet you half way...Best of Luck!