I'm glad your sister got herself help. I wish you would tell your T how you're feeling and would figure out how to get yourself a break/help in hospital if you need it. I don't think you would lose your job and if your boyfriend says he'd support you, I think you should give him a chance too; better to learn it now than later if there's a problem, etc.

No, death will not solve current problems and is not an answer to how to work through all this. I'm sorry for you all's struggle with the grief over the loss of your mother 2 months ago; hope things get a bit better soon.