What Are The Chances Of HIV Transmission Through Oral Sex?

12 days ago I had an encounter with a male that is hiv positive. I do not think we had sex. We had deep kissing and he performed oral sex on me very briefly. I do have genital herpes but didn t have an out break at the time. I take valtrex daily. I m extremely worried that I may have contracted hiv. I feel fatigued, have headaches, minor sore throat and my lymph nodes are sore by my genital (pelvic t zone). I ve been feeling those lymph nodes a few times the last few days so I m hoping they are just inflamed from doing that? What is my risk and should I take an over the counter test or go to a clinic since it s only been 12 days? I ve also been under a lot of stress worrying about this and having to move. Please help!