The doctor didn't check for a urinary tract infection? Besides STD's, UTI's can cause pain in the genitals (especially when urinating), and pelvic pain. If untreated the infection can get into the kidneys. A UTI test is really easy. You just pee in a cup and the doctor usually gets the results in a few minutes.
I can understand being scared about getting STD's. Like you said, you touched the condom and then your penis.
I hope you don't have anything. And I hope this makes you more careful in the future. It's not worth it to go to a call girl, it's too big of a risk.
I hope you feel better soon. Go get the STD tests no matter how scared you are. Whatever is going on is going on whether you take the test or not! Not taking the test doesn't change the results. If you do have something then you can treat it and feel much better. And some STD's are curable. Good Luck, let us know the results.
And please take your thyroid medicine!