I too am new to this. You can read my post and see. In the beginning you definitely feel physically ill. I threw up for two weeks straight, didn''t eat, lost about 10 pounds, cried most of the day even in my office. Some nights I only slept one hours and got up and went to work. But this too will pass. See a doc and get your blood pressure etc checked out. There are pills that they can give you to calm your nerves a little. I got some but never took them. Don't know if you are the praying type but it helps to calm yyour nerves and get rid of some of the anger.
Make sure you exercise and eat well even if you don't feel like it. You don't see her falling apart , do you? My dear H keeps eating well right in front of my face and has not missed a meal since he dropped the bomb. You have to take care of you. You have your daughter to take care of. I wish I had one.
DO NOT CALL OR TEXT YOUR W. I cannot repeat this enough although I am not an expert. If there is one mistake I wished I had not made when I found out was the constant pursuing. Read my thread and you'll see what I mean. I don't know how to link you so hopefully you can find it.