A week ago, I gave a girl oral sex. I performed it on her for quite some time, and here I am a week later with a sore throat. It's extremely hard to swallow, and it feels like something is blocking my throat. When I look at my throat I see redness and a white substance of some sort, and now I'm afraid she might've given me an oral STD. She's had Chlamydia before, but it was treated and cleared up over 6 months ago. How would I know for sure if this is an STD, or just strep throat?