I am so sorry to hear this ! No one would fault you for turning to comfort food at a time like this. But, LOVEXAVIE is right. Drowning in your sorrows in the food and drink will just leave your head reeling. You need to think clearly now. Also, the lousy food combined with the excess stress is breaking down your body. Do your best to try to eat as healthfully as possible. I know it's not easy, you do the best you can.
Right now, you've got to pull yourself together to the best of your ability. This was NOT your fault. He might say it was, but this was all about him and the other woman.
Do you have a lawyer ? If not, get a lawyer ASAP. Do you have documentation of his cheating ? If so, print up any emails you have and present them to the lawyer. You've got to protect yourself and any interests you have in that business. I know you're in shock, but you've got to talk to a lawyer to find out what your options are.
Do you have a bank account of your own or do you share one ? You might want to take out your share of the money and create your own account. Don't let him take advantage of you.
Is the house in your joint names ? Personally, I say kick him to the curb. Let HIM sleep in the spare room.
You're hurt. We do understand, but you have to take care of yourself. That means trying to eat right. trying to avoid any alcohol and getting a lawyer.
Take care of yourself !!