In serious need of a womans help, life seems worthless.?

Okay im 23 and have two children, my husband is very unhappy with me for lots of reasons mainly because I have a low drive and cannot please him. Our relationship is going downhill at a very fast pace. Im very unhappy with myself because I've put on alot of weight and I have a skin disease that is severly broken out. Im a stay at home mom and I have to depend on my husband for everything. I hate life right now and just need some words of encouragement. Anything will help. God Bless