You are the one that needs support, care and favours from your family the most. it's your turn to ask them to help you with little things.
Maybe you caring for your family makes you feel useful, or that you have a purpose when you help them. Makes you feel better?
Maybe a good thing to do is consider moving further from your family, and getting a job more suited to you, or a hobby that you enjoy?
My simple pleasures are bubble baths and getting to bed super early.
But I know how you feel, it is difficult to cope with - even if you are not single
When you go to the forums on the banner and it lists all the potential forums. On one side it has the 'ask a doctor' under that is one called mental health international. If you are bipolar there is an 'ask the doctor' site for that as well.
Best bet is to get a real doctor's opinion. Tough as it may be sit in the office and tell the doctor how you are really feeling. They may refer you to a psychiatrist or psychologist or treat you themselves. I suggest trying to get a referal to a psychologist because you are going to need to talk out your feelings about your father's death (I lost my mom when I was 8 - losing a parent is a big deal emotionally and there is no shame in needing to talk it out.)
Good luck