Anxiety and sex?

Hi, I have had severe anxiety for years and it is centered around my fear of throwing up. So I'm not a virgin I have had sex a few times before with my previous boyfriend when my anxiety wasn't so bad and I was okay. That was a bit over a year ago. Today I had sex with my boyfriend and also have oral sex for the first time. It is a few hours later now and I couldn't stop thinking about it because truthfully I thought it was disgusting. So now I'm having a panic attack and feel sick and I assume it's because of that because it won't leave my mind. I don't know what to do, is this normal? Do sex and anxiety have a relationship? What can I do to help it?