Hello we need to follow up for HIV status till 6 months as the incubation Period of the virus is long and then coming to your sore throat think it might be seasonal because of the changing weather also I suggest you to do salt water gargling regularly and also take Honey mixed with pepper Path from that you can also use Vicks or Strepsils lozenges and for headache gastritis may also be a cause of headache and stress induced headache is also there so please try to have your food on time and make sure that you have water well because dehydration is well also cause headache thank you