Welcome to our Forum.  I'll be glad to comment.  While it is conventional wisdom (and common sense) to not share towels in the fashion you describe, and while there may theoretically be a small chance that HSV or other STIs might live a few seconds/minutes on a towel, the fact is that there are not descriptions in the scientific literature where transmission has occurred in this way. There are several reasons for this including not only that the organisms quickly loose their infectivity (before they die they become non-infectious) and the interesting fact that these organisms all tend to "stick" to the fibers of material when they come into contact with cloth or material. 

I see no reason for concern from the contact that you describe and certainly see no reason for testing.  In fact, I would say that testing is a BAD idea and that if you were to have the blood test your chance of having a falsely positive test is considerably higher than your risk of discovering that you were infected.  I hope my comments are helpful.  EWH

Please be patient.  We do not staff the Forum 24/7 and do our best to answer in a timely fashion. 

In answer to your initial response to my comments, it appears that you did not hear what I said- there is no realistic risk of getting an STI from a shared towel.  As a result, testing is a waste of time.  I will briefly comment of your statements however.

The results of your urine testing for gonorrhea and chlamydia ARE definitive, believe them. 4 days is plenty of time for tests to give accurate results. 

I recommended against testing for herpes but you did it anyway. the results you have only tell you that you have not acquired herpes in the past.  The results of a herpes blood test (WHICH I RECOMMEND AGAINST) will not accurately reflect infection for up to three or more months after exposure. 

1.  Your blood test results have no bearing on whether or not the sensations you describe were herpes.  If your symptoms were due to herpes, you would see lesions.

2.  Hepatitis B is NOT transmitted by sharing towels in the way you describe.

3.  I cannot comment on what the doctor saw. 

4.  No, possible "irritation of the frenulum" is not suggestive of herpes unless there are visible lesions. If there are visible lesions, they should be tested with culture or PCR, not with a blood tests.

Your sore throat and other symptoms DO NOT suggest STI, including HIV.

Your blood tests show that you have no evidence of having hepatitis B or C.

EWH

You do not seem to be appreciating the message I am trying to convey.  Sharing towels is not a known/proven risk for STIs.  if it were, this would be described by now.  Your concerns are unwarranted!.  There is NO reason for you to continue to worry about STI from the exposure you describe.

As for your specific questions:

1. NO!!  This is not a risk factor for hepatitis B or C.

2.  No, without penetration you are not at risk for hepatitis B or C.  Neither of the sorts of exposures you describe place you at risk for hepatitis, HIV, or other STIs.

3.  Yes persons can certainly acquire more than one STI at a time.  That does not change the FACT that the exposure you describe did not put you at known risk for STI.

I have already describe why you are not at risk for hepatitis.  Please carefully re-read my earlier comments.  further, your abdominal pain may well be a result of the unneeded antibiotics that you are taking.  Both sulfamethoxazole and advil are well recognized causes of abdominal pain.

This is my third reply to your questions.  Therefore, as per forum Guidelines, this thread will be closed later today.  I trust that you will not feel the need to start a new post.  Repetitive anxiety-driven questions may be deleted without comment and without return of your payment.  Please try to move on.  you are not at risk for STI from the exposure you have described and continuing to worry will only amplify your unnecessary concerns.  EWH