New here...just found out H is cheating.

Hi, I'm new to this board but thought it would be a good place to come. Today I found out that my H is having an affair with his boss. He works in a hospital at night. Well actually two hospitals, one full time and the other 1 or 2 shifts a month. He just changed the situation in Nov. It use to be the other way around ( full time at the other hospital and pt at the now ft hospital) She is his boss at the now pt hospital. She is actually the director of the department he works in. He went to Vegas for the weekend with his brother and brother's girlfriend. But actually went with HIS girlfriend. I called the hotel after a large withdrawal from that hotel came across my checking account. I asked for his room and hung up and then ask to see if she had a room and she did. A friend of mine called and asked her a couple of questions that proved who she was. I have not spoken to him at all since he left on Sat afternoon.
My story started about 1 1/2 mths ago. He told me he was not "in love" with me anymore. After 19+ yrs of marriage. I am starting school and have been a SAHM for over a year. I have been looking for work but unfortunately there are no jobs available. I have looked into retail and my "former" career (dental assisting), with no luck. He has been sleeping in the spare room for about 3 weeks now. He goes out with "the guys" about once a week or more. Unfortunately we just moved to a new town this spring and I have only made one friend. She is great but has a boyfriend and works 6 days a week till PM. And H works nights so i need to be home with the kids. My mom lives over a thousand miles away and most of my friends live in other states. I don't have a support system right now and am falling apart. I think he knows that I know (this just literally happened today) but he's not here to confront me and I will not be home when he gets home. I am staying with my friend until his next scheduled day of work. He will get to be dad and wonder where I am.
Any advice at all would be appreciated!
Thanks, Cinsue