do you think it has anything to do with drinking all those strong young puerh?
I find I don't reach for them often even though I do enjoy them when I do.
The plantation stuff especially can get me feeling uneasy (relating to your anxiety, minus indigestion) if I drink too much at once. I wonder if this is because of pesticides, or because the leaf is more chopped releasing more caffeine then I am anticipating. Or maybe this is just the nature of young strong puerh?
As for the OP, only time tea has ever given me indigestion has been while drinking unknown shu at unknown restaurants in taiwan/hong kong.
Not every shou mind you, just certain ones were 'off'. So either it was sketchy food or sketchy shou. I go with shou.