STDs :: Unprotected Giving And Receiving Oral Sex

I made the mistake last week of both giving and receiving oral sex with another male. The other male is of unknown status and was a drug user/sex worker. I received the oral for less than a minute and gave it for roughly 10, with no ejaculation on either side.

Since then, I have had slight lower abdomen pain, a sore throat and what seems like burning urine/penis tip. I am in a monogamous relationship and really don't want to pass this on and certainly don't want to ruin my relationship by bringing this up, I'd rather deal with the guilt as this was a one time thing.

My questions are...

- What are the risks of contracting HSV, Gonorrhea, Chlamydia or Syphilis? (understanding that HIV is very low, if any risk, for oral)

- Is the abdomen/pelvic pain a symptom of anything?

- If the event happened roughly 4 days ago, would I be able to test for Syphilis, Chlamydia, Gonorrhea? I am going to the clinic this evening and asked them to give me antibiotics for Chlamydia and Gonorrhea anyways just in case.

- Would there be any risk of any of these diseases infecting my throat from his penis and vice versa?

- Should I abstain from any sexual encounter with my current partner? There would be no expectation of protected sex considering we are monogamous and saying no or we need a condom would certainly raise red flags.

- Am I at risk of anything else that I can't think of?

I am very worried about this encounter and would appreciate any insight and thoughts you can provide. Mainly, if you think I am at risk from this encounter and if I should abstain from any sexual encounter with my current partner given the circumstances.