How frustrating to have a couple of good weeks and then to go backwards- we do see it quite often with members, sometimes it’s because they were overdoing things & set healing back, but it doesn’t sound as if you were doing that? Like @Isaiah_40_31 says, it can take a while for the brain to adjust, and it sounds like you have plenty of other conditions all having a part in your symptoms…
If you haven’t read @GrnyAny 's post about how her vagus nerve has healed since surgery it might be good to look at, as some of her symptoms sound similar, it took a while for healing though:
Successful Surgery for severe Vagus Nerve Compression - General / Eagle Syndrome Stories - Living with Eagle
I hope that things start improving soon again 
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