Losing my mind.

I feel I'm Losing everyone out everything around me. I Lost my dad in 09 then my mother in law in June 11, my mom in July1. And I had to move into muy patents home (where they both passed) to take care of my grandmother who has dementia. I have 2 kids 15 which after their deaths he acted out horribly. And 6 she don't really understand but I've gotten so depressed I feel I've lost their respect.and my husband who we have been married10 years had got the worst of it all. He gets the rath of my problems.and I feel he's about Fed up. We have become so distant and argue so much that out throws me further inn the home I'm in. Most night I sit alone thinking what did I do to deserve this and how do I get back too myself who used to enjoy life.I fell I'm losing more than I've already lost.