Thanks for the reply Sabrina.
No, No soaps, etc. Maybe the chlorine - I didn;t get a filter yet.
But no, thats not it I don't think.
This weakness is like when coming from a sauna; fever inducement.
It seems so simple to just warm up, but it is agony to just get in the tub. I use my infra-red sauna to warm up too, a bit gentler than the tub. In a shower, I am still cold even as the hot water runs out, aND then I am in trouble.
Eating helps. Certain foods are better than otheres, just like teas are less 'cooling that plain water at room temperature.