An Incident Occurred Whereby A Prostitute Successfully Inserted My Person

An incident occurred whereby a prostitute successfully inserted my person into her mouth in order to perform fellatio. In shock i hesitated to push her off and she was on me for a few seconds before i got her off. Please tell me the odds of being infected with an std.

Also, i have been continuously pouring savlon on my penis in fear of being infected (paranoia is evident) and as such 2 days after the incident i started to feel a burning sensation on my glans and surrounding skin. (I am uncircumcised). 2 days later i noticed a discolouration on the left side of my glans and on the skin further below. Presently, the day after, the discolouration which can be described as a rash of sorts is still evident and more off greater sensitivity.