Being nonspecific, symptoms of acute HIV infection are not a reliable way to diagnose it.
These symptoms are similar with mono symptoms.
There are different forms of mono, and the one you may have, is with predominant lymphadenopathy (generally swollen lymph nodes) and sore throat doesn't need to be present.
Large swollen lymph nodes at the back of neck, is among first and very characteristic symptom of mono.
After 5 months, in case of mono the most prominent symptom is fatigue with other symptoms being almost diminished.
Test with HIV antibody test!
Best wishes!