Oh Sue. I hurt for you. I know exactly where you are right now. Exactly. I was there in July/August (can't believe how much time has gone by). I was watching H ignore me, snap at me, blow off the kids in order to nap and sit on the computer all day, being hungover, like he was in college. It finally got to where I took him aside, asked him about an affair. He denied it. A week later, it got worse, I asked him again, and he confessed.
Just get out tonight. Don't do it in anger, just say you are 'going for a drive' or shopping (heck, around this time, places are open late!), just feeling cooped up.