Thanks for posting your worry. Let me first of all reassure you that the swollen glands is not any sign of HIV or any other sexually transmitted infection and that of abscess
( still developing and will possibly collect into pus in a few days or resorbed). So taking an antibiotics such as cloxacillin
associated with an antiinflammatory such as ibuprofen
can help the abscess collect faster and can be drained by a competent health professional or it could just disappear after the treatment.
Let me tell you this, the chances of you getting HIV through oral sex
will strongly depend on you having tiny wounds in your tongue and mouth and her having tiny wounds on her vagina or vulva.
If these factors are not available, then it is not possible that you can have HIV.
The chances of you contracting HIV through oral sex is far lower than through direct sexual penetration.
I will also advise for security purposes that you contact your doctor for HIV serology testing for both of you and from now hence forth you should practice safe sex.
Hopes this reassures you