What does your anxiety stick on?

My long term girlfriend cheated on me. It was bad, I'm going to let her move on and not go into details. I couldn't sleep in the bed we shared for months. When i tried (after months) I kept waking up terrified because she wasn't in bed and I didn't know where she was. It didn't take long to remember but most of the time I wouldn't sleep for a few days after and I felt like I wanted to puke most of the time. Couldn't eat either. Hit the bottle hard. It's a bit better but I wouldn't wish these feelings on my worst enemy.