I have been having a sinus issue since July. Got my paranasal scan done which shows no major abnormalities. There is an s shape deviation of septum but ENt says no need for surgery. After several tests including cbc, thyroid, blood sugar all have come normal. Vit d & b12 are normal too. My ige reading is 495. Ent has put me on allegra. Have tried so many medicines yet throat irritaion and weakness has not reduced. Will allegra be the right treatment? Please help me.