I Am Suffering From Intense Facial Pain...after All Diagnosis Evry

I am suffering from intense facial pain...after all diagnosis evry doctor says evrythng is nrmal ..bt my pain is still the same after using so many tablets.And litle amount of stress in day ...tats all it gets trigged and pains continously through out the rest of the day...
Pain gets triggered with sweets sugar cold items ,ac, study of evn 2 hrs in a day ,sweet or salt biscuits..
Pain starts frm exact right upper jaw and continuos lik a flowing pain til forehead through a nerve
But evn MRI,dental history says evrythng nrmal
Pl sugest me ..wat do I do nw