What happened?

So today I had a guy over at my house for some quick fun. We didn't have enough time for vaginal or anal sex but we did do oral.

When he cummed, his dick was in my mouth and I swallowed the cum. Then he left. This was at 1:00.

However, tonight at 8:00, I went to the bathroom and ended up getting extremely weak. After laying on the floor for a minute or so, I got up and it started to happen again but this time my body felt so hot that I took off all my clothes and then again, layed on the cold bathroom floor. Then after another couple minutes, I got up and everything was fine.

I was feeling fine all day today, and now again since that has happened, however it was just a span of ten minutes that was bad.

Does anyone know if there is any correlation between swallowing the cum and the way my body reacted tonight?