Retroviral Syndrom (syndrome) (ARS) are highly variable. Some will experience no symptons, others will become so ill they are hospitalized. There are usually an array of symptoms that appear 2-4 weeks after exposure to the virus. Typically it's fever
lymph nodes etc. They will not usually come and go but are persistant. And a headache alone would not suggest ARS. It's likely that your headache is due to stress or other benign factor
only Headache mean nothing, you should worry for lymphf nodes or fever. ARS in general include fever rash lymphadenopathy sore throat that are more common than a headache. If u have fever or if you have flu its normal to haave headache.