For what it's worth, I read somewhere that the darker roasted coffees
contain less caffeine than the lighter roasts. The longer roasting
process apparently causes the caffeine dissipate. Also, I believe
that there is not nearly as much caffeine in tea and most soft drinks
as there is in coffee.
I'm not sure if caffeine is the problem, as you say. There might be
some additives that could cause anxiety, but I'm guessing that these
would be more likely to just give you a headache.
I went through a bout of anxiety a while back, and I found that coffee
seemed to exacerbate the problem. Now that I've gotten the anxiety
under control, I'm back to drinking coffee without any problems.
Let's hear what others have to say on this.
Gary