Thoart Discomfort Since December 2014. Started When I Finished Cephalexin

Thoart discomfort since December 2014. Started when I finished Cephalexin 4 sinsus infection . I use 2 smoke then. Been 2 ENT Dr twice, ER twice, Regular Dr. They looked dwn thoart & felt of thoart . Said nothing serious was wrong . ENT said was tonsilits. Took Antibotics & Steriod Medicine . Haven't gone away . Its been months . It better than it was but its still a discomfort feeling . Doesn't bother me to eat, drink, swallow. Dr said maybe its allergies . But its been like this months straight . I didn't know it at the time. But when it started I was about a month pregnant . Im 37 weeks pregnant now. So Im limited 2 wat I can take. But I don't understand y its still bothering me after all this time.