Flu-like symptoms immediately after sex is NOT an indication of an std. Don't scare this person like that. This is why we have so many people with std anxiety.
You will not get std symptoms immediately after sex. They start 2 days after exposure at the EARLIEST. And your biggest threat was the oral sex she gave you. You should know that the chance of anyone getting an std from oral sex (giving or receiving) is very very low. And only a few seconds is not going to get it done anyway. It takes prolonged sex. AND these days escorts regularly get tested. It is not good for business if they give a client an std. Do not worry.
I think you should consult a physician so that He or she can give you proper medication
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You did have a risk but it is to low to worry about, you had condom protected sex your only low risk is unprotected oral. I wouldn't be concerned right now as your encounter was really a low risk. The symptoms you have are not std related, you wouldn't have symptoms in one day.
Im not the expert here but based from my observations in this forum. Oral sex carries a low risk in terms of STDs and zero with HIV.
I think you are fine for as long as the condom didnt broke.