I received fellatio and ejaculated in a girls mouth exactly 1 month and 3 weeks ago. The day after i received it, I had swollen lymph nodes and swollen tonsils. I went to the clinic and the doctor said it was tonsillitis and gave me amoxicillian. Throughout the duration of taking the meds I felt back to normal however, swollen lymph nodes still occurred. 2 days after I finished the anitobiotics, the swollen tonsils came back worse. I tested negative for mono and was given cephalexin in case it was strep throat from the doctor at a local hospital. Again, I felt normal again while taking the meds, but my lymph nodes were still swollen. This time, 2 weeks after I finished the meds, the swollen tonsils came back. The lymph nodes still are swollen.
Is it possible I have mono and got tested for it to early? or do I have an STI/D?