Does anyone experience this??

So I will start out by saying I've talked to my doctor and he says this is just my nerves. Does anyone ever feel sick after an orgasm? Whenever I have sex with my husband or masturbate I feel sick for 15-20 minutes. If I have sex with no orgasm I am completely fine. It is extremely annoying. Has anyone ever experienced this? Its the most awful thing, I love sex and just want to feel good after.