Crowlee - I have the same symptoms as you. For me, COVID blessed me with a whole set of food allergies - one of which will make my eyes swell. I did the elimination diet for two months and found allergies to dairy, blue-mold cheeses, such as Stilton, Roquefort and Gorgonzola, gluten, nightshade vegetables, sugar, cream and corn.

I had heat intolerance for about three years Post COVID...could not even go out for more than a few minutes in the summer...but that has improved. Dysautonomia from COVID can cause this.

I am taking LDN now which seems to be settling down some symptoms including providing pain relief. I still have food allergies but not as bad...and still have fatigue but I can now walk half a mile almost every day.