True blue I can totally understand your angst, I know what it feels like to have been given a really bad deal in this 'game' of life and it sounds like some really unfair things have happened lately to you that would make me want to rage against the pain also.
I guess my biggest suggestion would be not to judge yourself as 'weak' , we are all different and unique and have strengths and weaknesses, try to look at some of the positives you have in you, because i'm sure they are there....even if it doesn't feel like it at times!
my other suggestion would be volunteer somewhere to help others, it will take your mind of yourself and help improve your self esteem. Exercise is another thing that helps me, that said i've been in bed for the last three days so I totally understand it's not easy At ALL.
Anyway, I wish you all the best and take it easy on yourself, you are precious and deserving of peace
Take care