Please, please help me? I can't do this?

Hi there,

I don't know what to do anymore. I work, go to school full time, I have Fibromyalgia (a chronic pain and fatigue disease ) and Endometeriosis. My parents ignore the fact that I am sick, they don't support me and they never have. I have never been good enough for them, no matter what I do it is never enough. I work so hard to make them happy, on top of everything else I keep the house clean and that is a huge task...I clean up after 5 other people constantly. They are always yelling at me telling me what I could have done, or what I didn't do now, they are never just happy with what I do. I need help and support from them with being sick but they don't help me or support me they just ignore it and pretend like it doesn't exist when I am in large amounts of pain every day. Each day is a struggle for me, I push through the pain in all that I do and I never stop or never give in but it gets really hard. I just don't wanna deal with them anymore, they don't get it...they blame me for our relationship problems saying that I take advantage of them and that I don't care about them...please what should I do? It is really hard when my friends at work care more about me then they do. Will I ever be enough for them or should I just give up on them now? I am really having a hard time dealing with everything, work full time, school full time, the constant pain...please if anyone has any suggestions or words of encouragement I would really, really appreciate it.