Hello, Thanks for the consult... 1. The chance of getting hiv by the oral sex is high only when you swallow the cum (sperm) of your sex patner otherwise the chance is very less 2. You mentioned some symptoms like sore throat, running nose etc just after 3 days of intercourse or oral sex. Hiv symptoms will only be there after 6months-3years but not just for 3 days of exposure 3. Headache is the common problem when you are thinking alot or when you work alot or sleeplessness can result in headache 4. For dandruff please use ketaconazole 2% shampoo on the scalp 3 times in a week in regular intervals. Eat protein rich diets and vitamin tablets containing zinc 5. Gum bleeding is possible due to vitamin C deficiency so try to eat citrus fruits or use B-complex with vitamin C tablets Think this information will helps