Purely anecdotal obviously, but I've had somewhat similar issues in the past and ended up figuring out that they were related to reflux/LPR. If you haven't already looked into that possibility it might be worth reading up on it.
My issues have been resolved by controlling reflux and they rear their heads again when I allow the reflux to return for more than a very brief amount of time (ie. I stop paying attention to the food and drink I consume and my intake of <things that trigger my reflux> becomes too high for a sustained amount of time)
My issues have been resolved by controlling reflux and they rear their heads again when I allow the reflux to return for more than a very brief amount of time (ie. I stop paying attention to the food and drink I consume and my intake of <things that trigger my reflux> becomes too high for a sustained amount of time)