You need to be seen for a sexual health check up seen as you had unprotected sex. It's impossible for us to tell what this could be. It could be something or nothing. Try not to worry though as it doesn't sound like an STD to me.
I have been tested for std and its negative but not for herpes. Everywhere I read they say it's a sign of herpes. I don't know what to believe. I get this unusual feeling after I pee. During unrination it burn occasionally. The tingly feeling is the towards the buttocks as well.
It can be a sign but it's usually followed by painful blisters. You need to wait three months from when you had the unprotected sex before you can test for herpes so I recommend getting a test to be sure mid February.