Iam a diabetic . After i started metformin i have some or the other throat discomfort.. i was pushing and taking out mucus from throat. Mri and ct scan shows normal except ethmoid sinus . Now one of my tonsil is little swollen but i dont have any difficulty swallowing or pain. Although i feel like something is there in my throat when im swallowing. I use to be a light smoker so iam scared if it is something to worry about.