Pimple like structures on back of throat

From last 1 yr i have pimple like structures on back of my throat and it is causing discomfort sometimes i have shown it to doctor and he gave me anti acid syrup i tries it for two months it didnt worked then he gave me levocetrizine that too didnt worked then i showed to other doctor he gave me anti inflamatory drug although it decreased the pimples size it was still there and as soon as the medication finished it went to its normal size please tell me what to do ... The second doctor told me it might be a allergy from something and it will not go by medication ... Sometimes i feel like the opening between the back of my throat has decreased sometimes it is completely normal ... And yes my first doctor told me that this is due to acid reflux but i have a good digestion as far as i know and i dont have any acidity problem ... So please give me some suggestions what to do