Did your doctor test you for Streph? You could have some alergies or something else going on too. Did your doctor do any swabing of the area to see if you have any thing?
The medicine you are taking won't take an effect instantly. Does your partner know her status? If not you can have her get tested if her last sexual encounter with someone else was 4 months ago. If shes negative then you don't have Herpes.
Did the doctor do a throat culture? The only way to know if this was herpes would be that.
There's more a chance it's bacteria or viral as opposed to herpes; most herpes occurs on the lips, and a one-time encounter is also a low risk.
Acyclovir won't do anything for you if it's not herpes! If this is strep (again, no throat culture??), you'd need an antibiotic, not an anti-viral!
If you did have cold sores in the past, and they were HSV1, and she had HSV1 as well, then it would most likely not be. Still that's a lot of ifs.
Even though you performed oral, the virus would have likely had more contact near the front of your mouth versus the back of your throat. Again, only ifs, but it may be something else.
good luck