How very odd!!! It seems we have almost EXACTLY the same issue! Will reply to your message in sections to make it easier for you to read.
I too have it on the left side only, like an inch to the left of the sticky out bit on my adams apple. This is EXACTLY where the granuloma was found also. A granuloma is just damaged tissue from acid or trauma which is similar to a cyst but it's hard-ish and takes ages to go away.
I too have the throat clearing "need" hundreds of times a day. For this...do your very best to NOT clear your throat. Clearing actually made mine worse and made the need to clear my throat happen more often. It's still always there but way better no I resist the urge.
Also, I am the same as you, I feel fine firs thing in morning but within half an hour it's back again even if I don't eat/drink or talk. Can only assume it's had time to rest (in both of our cases) and some act of being awake causes signals to be sent to remind us it's there? Not sure.
Good news on your scopes!! Means even if yours is caused by acid (which it could be as they saw redness which indicates acid damage lower down which could mean it made it to your throat) that you can deal with it easier as you've no serious underlying cause which I do so it's harder to keep the acid reflux at bay.
Funny you should mention the nerve damage, I did read online about folks damaging the vegus nerve in their throat which lead to all sorts of odd feeling and symptoms in the throat...If it's that, then it's going to be tricky to deal with.
Well, I still feel that in myself (based on my results) and you (based on what you've said) that LPR or even standard acid reflux could have caused the damage in the first place which is leading to our issues now...even if LPR and Acid are no longer occurring.
I'll say that Gaviscon and all my other tablets have done nothing either, but then again, they're not designed to fix the issue we are reporting, they're designed to supress the cause of the issue (acid) which then gives the damaged area time to heal.
I don't get any burning now no, I used to have it a lot many years ago which is why I know I suffer with acid (along with the tests confirming it).
Funny you should ask about how it started...I can almost pin point the exact day! I had a heavy meal one evening along with some wine, I woke in the morning with a sore throat but it wasn't like a normal sore throat, it felt like my throat was burning! It went away though within about 4 hours...
I was left with a lump feeling in my stomach which I've had in the past which was proven to be caused by acid reflux damage in my food pipe which reddened the area. About a week later that also went but I was finally left with the throat problem...
How did yours start and how long have you had it for?
BTW, I too have had blood tests, thryroid tests and also an ultrasound on my throat which revealed nothing.