Your symptoms do not suggest STD. Discomfort a few hours after sex ('the next day') simply cannot be an STD of any kind; no infection can show up that quickly. The whitehead probably was exactly that; herpes looks quite differnt than that.
There was zero risk from condom-protected vaginal sex. The only theoretical risks from receiving oral sex are gonorrhea (which you would know because of symptoms); herpes, which your symptoms don't suggest and is extremely low risk from any single such exposure; and non-chlamydial, nongonococcal urethritis (NGU), for which no lab test exists--you just have to rely on symptoms. The theoretical risks of syphilis and HIV are too low to even consider. And the antibiotics you had will assure that some of the tests you describe (gonorrhea, chlamydia) will be negative.
So I recommend against any STD testing at all, unless there are other STD risks aside from the one you describe. You'll just be wasting your money. What are you going to do, go off for STD testing every time in your life you have sex with a new partner? Get real.
Bottom line: You are overreacting in a big way. Just forget the whole thing.
Good luck-- HHH,MD