Hi, We needed some advice on Std. Here's what happened (sorry for being so detailed)

On 1 Jan 2014 my wife and I had unprotected oral sex with a male sex worker. The oral sex involved:
- Him licking wife's vagina for around 10 min
- My wife and I sucking his penis for around 20-30 min
- him sucking my penis and licking my anus for around 20 min

On 1 Jan in the morning I woke up with a bad cold and both during the next 2-3 days my wife and I had upset stomachs.

On 18 Jan my wife got a rash inside her vagina. The rash cause dryness, very small bumps on the inside flaps, white stuff coming out which was more than usual and a bad itching feeling.

On 22 Jan I got a boil/ watt next to my anus that also itched. The boil is still there but seems to have reduced and itching also almost gone.

My wife went to the gynac and who gave her some cream to put on the outside of her vagina, a table to swallow and a tablet to insert in the vagina. The gynac said it was normal rash and nothing to worry. However my wife did not inform the gynac of the sexual encounter. The rash has cleared up now but not completely gone.

On 25 jan I got some blood tests done for HIV, Herpes, syphilis and hepatitis B.
All tests came out negative however I will receive the herpes test results tomorrow.

That's the story. My questions are:

1) what stds could we have got from the oral sex
Especially what are the chances to have contacted HIV?

2) is it too soon to have tested myself for the stds I read that one should wait 3 months for a conclusive std result

3) since the gynac said its nothing major would her diagnosis be correct, considering my wife did not tell her that we had unprotected oral sex 20 days back

4) should i worry about another stds than the ones mentioned above and if so when should I get those tests done

5) finally how worried should we be on a scale of 1 to 10?