I have just been diagnosed with acid reflux disease after having almost identical symptoms to yours. I saw an ENT doctor who inserted a flexible camera up my nose and down the back of my throat(it was painless and very quick),I then had to have a bigger camera inserted down my throat under general anaesthetic(had a really sore throat after this one).I now have to take 2 tablets a day to control the acid reflux that I didn't even know I had which is caused by some anti inflammatory painkillers I have to take.The sensation of having something stuck in my throat has now gone :-)