Not myself anymore.I think i need to seek help or take depression pills or somthing?

To make a long story short....Oct 2008 my mother had a stroke and doctors found a huge blood clot in there brain. The stroke and brain surgery left her disabled and unable to take cake of herself my 7yr old sister and my then 13 year old brother. The state tried to take my sibs but I fought real hard for custody and won. its been three years since life changed for me. I'm now 26 with no kids of my own but raising my sibs as my own. 2009 I moved my disabled mother in my home just so we could be a family again:) but she needs more care then I thought. She can't walk, she can't really talk,can't dress herself she wears diapers...etc and she's only in her 40''s. For months now I've been having random crying spells even when I think I'm happy. my weight goes up and down, my hair is falling out, and I have trouble sleeping, no social life. I no longer enjoy doing the things I use to love:( OMG what is wrong with me? This is not me.