Yeah, I went through that too. I couldn't eat for two months. Use it to your advantage and lose some extra weight, do some nice things for you. Treat yourself very kindly and carefully. It's okay to feel bad, it's okay to cry, it's okay if you want to go to sleep when you get home from work or after you pick the kids up from school. You are going to feel terrible, it's a rollercoaster ride. I remember feeling like my insides were splitting apart. It was completely nightmarish. If possible find a local group, church group, friends, to help you through this. It will help!!!!
Actually, once you accpet the idea you won't get your husband back and start creating a life for yourself, that's when you'll finally start to feel better. Being sad and broken won't bring him back. It's not attractive.
There is no arriving, ever. It is all a continual becoming.