I can understand how a lot of your current concern is due to anxiety- and obviously you recognize that as well.
As far as the risk from unprotected sex with a worker in a sex parlor- there is a risk, albeit low. While I am sure she tried to reassure you, one can never be positive as to how reliable that is. If I saw you in my office I would consider "post exposure" meds. The risks include bacteria ( gonorrhea, chlamydia, syphilis especially), and viruses ( HSV and HIV).
The greatest worry people usually have is HIV- if she did not have HIV- your risk is 0. Even if she did have HIV, from 1 single exposure and vaginal intercourse, the risk is actually only about 5 in 10 000 ( 0.05%) so statistically a pretty low risk from a one time exposure. but not zero.
At a minimum I would advise that you see your doctor for follow up testing - including testing for gonorrhea, chlamydia, syphilis and HIV- with follow up HIV testing at least at 4 months ( with the current 4th gen test).
And of course if you have other sex partners/ a wife, you really must not have unprotected sex with her until you have had follow up testing to make sure you cannot pass anything to her...
Of course if the parlor woman can be tested and can show she is indeed clean... then your worries are gone. But unlikely to get her to be tested I imagine
I hope that helps.
Please be aware this response is for information only, and does not constitute a physician- patient relationship Follow up and proper assessment by your personal physician is always advised and may lead to other appropriate recommendations based on additional information.