Oral sex either way, does not carry any risk of HIV transmission
Diver58 has said that HIV is not passed on through oral sex and that you do not need to test. I totally agree with this. Oral sex is not a risk for HIV as the virus is inactivated by air and saliva. The ways that you can get HIV are by having unprotected vaginal or anal intercourse or sharing of IV drug needles. If you don't do these things, then you will not get HIV. Symptoms are not used to diagnose HIV and since you had no risk, your symptoms are not related. Yes, stress and anxiety are likely to be causing them. So, no need to test, no risk.