Hi there, new here, and I am terrified

Basically I had unprotected intercourse like an absolute idiot

I am male.
After the event, literally the morning after I felt sick as hell with every Flu symptom in the book. This was 9 days ago and I am just getting over the sickness. A couple days ago I got a spot just below my lip, a pharmacist said it wasn't a cold sore and said it was nothing (but I am not sure if they are right as they didn't know my circumstances).
Now I dunno if this is in my head or not... but I feel like my penis is a bit errrm heavy? But I don't know if it's psychological or not.
So you think I have anything or not?
Thanks in advance.