It’s good to hear, you are doing better.
I live in Mid TN as well and spend my fair share of time on the water. Persoanlly I think there is alot more autoimmune conditions out ther due to what we eat, STRESS, increased workload, etc.
Our rivers are cleaner than they have been in decades. I think food processing could be an issue, but not the rivers.
Get back out on the river. Swim, catch some fish and if you find the mother lode them call me. I’ll be there in a couple hours!!!