Hi Shellb,
I also have the stomach anxiety and also acid reflux, I find that ginger tea - as well as tasting lovely, settles my stomach. I buy "Twinings Settling Ginger", it's so good I now drink as much of that as normal tea (which aggravates the problem). Ginger tea actually calms the acid problem for me, ginger is known to settle the stomach, sometimes I also chew a small piece of raw ginger. Ginger tea is caffeine-free of course, no milk, so avoids some of the known aggravators too.
Unhinged x