Thank you for choosing DoctorSpring.
I understand your concern and will try my best to help you.
Now to your specific question "realistically could this be caused by HIV infection ?"
My answer would be VERY UNLIKELY.
Oral sex is of a low risk for HIV transmission. The concern here is the active wound you were having at that time. If it was not for the would I would have said extremely unlikely. I hope you do understand there is indeed a small risk of HIV transmission which can only be ruled out by further tests.
The symptoms you are having - the swollen glands predominantly are non specific. This as such is not very suggestive of acute HIV or HIV Seroconversion illness. We do see a lot of similar findings in clinical practice and only very rarely they turn out to be.
So to conclude, realistically you should be safe (single, low risk sexual encounter), but HIV tests are a must. Go for a HIV Ag/Ab (Combo test) test.
Hope this helps
Feel free to ask followup queries