Sore throat making me insane?

six weeks ago i had food poinsoning i kept putting my fingers down my throat to be sick the next day i felt fine but had a sore throat and everytime i yawn or sneeze i get a pulling pain and the it creates a sore throat for an hour till it calms down,ive been to the doctors three times and they say it all clear .could i have pulled a muscle and if so what can i do to relax it