I got blood tested at a GUM/Sexual health clinic last September and everything come back ok and have had no new sexual partners since.

It's just since then i have had Geographic tongue, Molluscum and now i think i have thrush.

I'm scared that i have HIV or something. I keep trying to reason with myself and tell myself i have already been tested but i'm starting to think they have made a mistake or didn't test my blood for HIV. Why else would these things happen to me?