JB,
I'm another one who has developed these issues since entering peri. I had no idea what it was, thought I was dying (my health rationale has gone out the window since this whole stage started). My mother who suffers from these symptoms clued me in. Sometimes it's managed, sometimes not so much. One thing I've started taking is apple cider vinegar with the mother. I don't know if it's psychosomatic or actual, but I do find my symptoms have lessened in severity since I've started it. 3 months so far.
Sparkle is our resident expert in these matters, I think. Her shared experiences have helped me cope with this.