You should probably talk to a psychologist regardless, as the psychological impact this is having is very apparent and mental health is just as important as your physical health.

This might be obvious and you may have already done a study for this but have you looked into sleep apnea? I had the first two symptoms you described for about a year and it ended up being mild sleep apnea and acid reflux related. Obviously your case could be completely different, but good to rule out. Now I wear a Somnomed mouth piece at night and take acid reflux medication day and night.

No more brain fog.