Well, you already know your anxiety can't handle these encounters. Maybe you should stop having them?
There is a very slight risk for syphilis. Syphilis is uncommon in developed countries like Italy - and the US, UK, Canada, etc.
There is a risk for gonorrhea, chlamydia, NGU and genital herpes type 1 (if you don't already have oral herpes type 1).
You can test for syphilis at 6 weeks. You can test for the others at 2 weeks. Don't take any antibiotics, or you'll have to wait 3 weeks after taking the antibiotics to test.
Don't bother testing for herpes unless you get symptoms. 67% of the global population has hsv1 and the vast majority of them never show symptoms. The blood test, if you can get it where you live, misses a full 30% of infections, and if yours is positive, you won't know if it's an oral or genital infection.
Oral sex is lower risk than vaginal or anal sex. Most experts don't think one act of oral sex warrants testing.
There is no risk for HIV or hep B or C.