Update: Got back on Carvedilol last week and the crazy anxiety symptoms went away. Since then I've also figured out that the Carvedilol was masking the symptoms of a psychological issue that I didn't even know I had developed. The issue was that I had sub-consciously lost confidence in high speed high volume traffic over a short period of time. That has since been addressed - now all my anxiety/hyperventilation crap is gone. It never was the meds. The anxiety issue was with me.
Thanks all!