Dear patient, Yes it is true that tattoos through used needles spread HIV but HIV doesnot become symptomatic in a few days. It takes weeks for HIV to cause symptoms, that too which occur progrssively and gradually. As you say that you were extremely tense and nervous and continue to be so due to fear of HIV, you are getting headaches due to anxiety. Anxiety unknowingly causes immense amount of facial and jaw muscle tension which leads to generalised and disabling headaches. So the first thing you need to do is to relax cause its not HIV. Take OTC pain killer for headache, as per your physicia s advice and take a sound sleep of 8hrs at night. Engage yourself in sports and hobbies , and as your anxiety settles, your headaches shall go away too.