Kass, bless you, don't you dare give up! You are a lovely person and the world needs you, even if it doesn't seem like that just now.
The rejection and abadonment are the hardest things to cope with, I used to sit and dwell on the fact that W had left and didn't wnat anything to do with me, why, oh why, what had I done, how could she etc etc. Thing is, I now realise that I am worth more than that. Just because W feels like that, doesn't mean the rest of the world does. I am worth a lot more. No more self pity for me.
It takes time to be able to shift your perspectives, but it WILL happen.
It seems to me like you BOTH need some me time. Some time for reflection on who you are and what you can do to improve yourselves.
Your H is hurting, you are hurting. Take time for yourself, he will too. Search inside yourself for the REAL reason you are where you are. It took me a long time to be able to do that, and you know, I realsied that I had been carrying round a lot of baggage from my life that really wasn't any use anymore. That's been thrown away now and I feel much better for it.
Eat, sleep and look after yourself, then you will feel stronger and more able to cope.