Hi Gary, I have read a lot of your post because your situation sounds similar to mine. I saw one post mentioning that you think your thumping had to do with loud music . Can you explain more what happened and how long the whole ordeal lastest?
With me- the morning after I had been listening to very loud music with earbuds ( using them on a walk near loud traffic so I didn't notice just how loud it was )..I went to bed that night and woke up a few hrs later with the thumping/fluttering in the left ear. Intermittent -on and off all day. I went to the closest urgent care - and also like your story they assumed I had a sinus issue. I took sudafed for a few days and nothing. May I ask what was your music situation and how long did the thumping last ? I am trying to get an appointment with an ENT but the GP suggested first to go to audiology but I was told they will just test for hearing- but my hearing is fine its just the thumping which is making me anxious at best- and if it keeps going probably will make me go insane its so annoying. The GP did recommend Flonase Which Ithink you said you think it worked for you -but how did it work if your issue was noise related and not sinus ? I am going to take it since they suggested it but doubtful its the issue.