Welcome to this forum.
As we discussed in your recent thread on the STD forum, I doubt you have genital herpes. Until and unless you have had a confirmatory lab test (e.g., a blood test stongly positive for HSV-2, or a culture or PCR test from a recurrent genital lesion showing the virus to be present), you should not assume you have genital herpes. I strongly urge you to get tested, if that hasn't been done; you can expect good news from the result, so why not do it?
As for your current risk, whether or not you have HSV-2 doesn't make much difference. Having HSV-2 roughly doubles the risk of HIV if exposed -- so if your baseline risk of HIV is, say, 1 chance in a million (which is probably about right for the exposure described), a doubled risk makes it 1 in 500,000. That's still zero for practical purposes.
Anyway, the odds are low your commercial partner had HIV avery low. My Dutch colleagues tell me that most sex workers in Amsterdam's RLD are tested regularly, are highly educated about safe sex, and use condoms regularly, and that few have HIV.
Finally, as you apparently understand, the risk of infection from a condom-protected vaginal sex exposure is very low. In theory, could you catch HIV by infected secretions coming into contact with HSV-2 infected skin? Probably yes. But with such a low risk that it isn't worth worrying about.
As for the biological reasons, that's rather complex. The bottom line is that it is highly improbable that this event would allow sufficient amounts of HIV to come into contact with sufficient numbers of the special cells that are susceptible to initial HIV infection. See the threads below for more detailed discussion.
http://www.medhelp.org/posts/show/1119533
http://www.medhelp.org/posts/show/1319634
The main thing is that the exposure you describe doesn't warrent HIV testing at all, whether or not you have HSV-2. But assuming you go ahead with testing, you definitely can expect a negative result.
Best regards-- HHH, MD