Hello!
It sounds like a tough time!
I have suffered very badly from depression in the past with periods of hospitalisation, and with the patience and support of my family, have recovered very well. I'm afraid I can't offer much help, except to say that I sympathise with you.
To me, it seems like your son is very out of touch - with the effect that his illness is having on you, with the good things that you want for his future, with the unsustainable nature of the home situation... and most importantly with the notion of formulating a future vision for himself that he can work towards, in which he will be autonomous and also feel that his life has a bigger meaning. For some reason, he seems to be stuck in a rut and not moving forward with his life. These resentments that he is holding towards you must in some sense feel legitimate to him, and you can't really make that go away without addressing it somehow... but at the same time, all of these supposed debts that he seems to feel you owe him will not help him to move forward with his life! It is so sad that he is not able to see you as a cooperative partner in moving forward with his life.
If I were you I would be making appointments to discuss your concerns and his progress and outlook with his medical health providers. I am not sure what they will suggest. I think that the important thing is to establish a cooperative feeling where you think that they will work with you and your son to get the best outcome for your son. It may be possible that you will go to a meeting and the health provider will start accusing you of your "shortcomings" as though your son's words are coming out of their mouth... in that case you can maybe seek an alternative health provider to work with your son. The most important thing is not really to assign blame... but to formulate a plan for working towards a better future.
What kind of goals does your son have... is he engaged in any educational program towards future sustainable employment, whether university or a trade apprenticeship? After my last hospitalisation I decided on something that I loved and cared about, and I went back to university to study it... my undergraduate degree was difficult but I just kept at it, using it to increase my concentration and my good feelings about my competency, building myself up... something like that.
A well formulated and articulated plan clearly seems necessary to take action in moving towards the next step. It seems apparent that you can't keep going with these care interactions that do not seem to improve matters... you need to move towards results that you can all see and benefit from.
Good luck to you... it is good that you are wanting the best for your son and taking care of him... I am so sorry you are so exhausted... hang in there and I hope things will improve for you and your family.