One thing that concerns me...
...I don't like to hear about chest tightness.
I know nothing about it, but I remember having it, once, during a blood transfusion.
I had a series of them but one unit seemed to react on me, though only for a few seconds.
Get a professional opinion, I think, if you feel it's best...giving up all substances not in your usual daily routine.
Sometimes I even wonder if prepared things like bread, or toothpaste, have their formulas changed without notice.
You are so smart to think of the water!
I never was a water-drinker, but now I drink eight to ten cups per day, thanks to sprinkling two teaspoons of psyllium on the top of a two-cup mug of hot/warm water, at least once per day.
Don't stir spoonfuls of psyllium INTO drinking water, it just clumps.
Thinking of you well.
F.