protected sex is safe sex. you did not get HIV. 2 days is too early for symptoms, and symptoms are never used to diagnose HIV. I do think you have anxiety though, I've been in your shoes before, not eating, heart racing, couldn't sleep, couldn't focus at work. it was indeed my own mind causing the problems.
The only risks for HIV are:
1) having unprotected, penetrative vaginal or anal sex, or
2) sharing intravenous drug needles
Protected sex is safe sex, as long as the condom did not visibly break - and you would have known if it did. I don't know what is causing your rash - no symptoms of HIV would show up that soon, and you didn't have a risk at all. Talk to your doctor about your rash, but it definitely has nothing to do with HIV.