My mother is also a hypochondriac! Judy, your story is very close to my heart. I have 5 brothers some with wives some not. Only one helps at all. I used to resent them all, even the one who comes around 'at his convenience', but now am just grateful he comes to see her at all. I gave up the hate and resentment a while ago. They will have their guilt to live with for not seeing and doing for their mother. You can stand up tall and be proud that you did what you could for her.
Some of us have compassion and love, and some only care about their own selves. I too lived in my mothers house, and this past year the brother who only visits at his convenience persuaded her to turn it over to my husband and myself for all we have done for her. The others now have no say when she is gone.
Good will come to you for doing good and loving your mother enough to care for her.