Welcome to our Forum and thanks for your question.  I'll be glad to comment.  There are several elements to your question so I will break my reply up.  The bottom line however is that your risk for HIV and other STIs is very low and there is little reason to be concerned.

1.  Your 11/16 exposure was a no risk event.  Condoms are still the best means of preventing STI and HIV acquisition if a partner happens to be infected.

2.  Your interstim procedure in no way affects your risk for HIV or other STIs. 

3.  Your 11/4 exposure was low risk but if your partner was infected there is a small chance of infection.  Most people, even most commercial sex workers do not have STIs and even if your partner was infected, most exposures do not result in infection.  The brief duration of your exposure also reduces the risk for infection.  If i were you, I would have no concerns whatsoever and probably would not feel the need for testing.  If you are concerned, testing is easy to do.  Tests for the most common STIs, gonorrhea and chlamydia will be reliable at this time but test for HIV will be 99% reliable 4 weeks after the exposure and completely reliable at any time more than 6 weeks after exposure.

4.  The swollen node you have noted is a non-specific finding.  It does not suggest HIV and could be due to just about anything.  If it raises concern, testing as described above in no. 3 is the way to go.

Regarding your problem with the earlier post, I suggest you contact the ASHA forum site administrator.  They are very good about resolving these things.

I hope that this information is helpful.  If anything is unclear, please feel free to use your up to 2 follow-up questions for clarification.  EWH