The original bump sounds like it was exactly what you describe, a pimple or folliculitis (hair follicle infection). It doesn't sound like an STD, and no STD would appear as a new bump only a day after exposure. None of the other symptoms sound like any STD, with the possible exception of the pain during urinating. (Definitely not the odor, red spots that change with erection, or yawning.)
Just tell the doctor your symptoms and let him/her decide what to test for. The main thing is to be sure you don't have urethritis (infection in the urine passage) such as chlamydia or gonorrhea. A urine test can check those out. No other STD sounds likely.
Good luck-- HHH, MD
Best wishes-- HHH, MD