<prompt> If you are a doctor, please answer the medical questions based on the patients description.i got tested for HIV about 4 days ago it was negative i went because i started feeling dizzy with nausea now i have white coating on the back of my tongue and red swollen grains on back also my tongue is swollen i feel a gag reflex im very scared also i get a tingly sensation on my feet  <response>: Hello thanks for consulting at Chat Doctor.u could have oral thrush, a fungal infection causing white coating,,,also capsulitis of tongue at the back of tongue,clean your tongue with soft brush, and could take topical antifungals.with the prescription of you are oral medicineoral surgeon .take course of multivitamins.do salt water gargle,either ways consult an oral medicineoral surgeon specialist.hope it helps,TC 