First, is there anything you can do personally to improve your mother's health? You said you want to die, but that wouldn't help her.
Second, you said you 冇心機溫書, why don't do it for your mother?
Thrid, about your 感情問題, I don't know how to help you on that one...
Overall, find someone to talk to, seeks support, surround yourself with people who can help you!
If you want to talk to me. My e-mail is [email protected] or add me on [email protected], sorry i can't be there to go throught this with you (I'm in UK!)