I have tried it but i didn't want to get dependant either so just took 1 and had quite bad side effects. Herb tea is great don't know about cammomile because it gives me panic attacks, peppermint is a good alternative for caffeine something that taste's nice.

ginseng is a stimulant so a BIG NO with panic/anxiety.
am currently on no medication still get attacks but not as much as when im on medication.

note: i don't know about anybody else but with me the better the tablet the more you have a chance to get dependant even if you don't get addicted attacks can be made worse after weeks of feeling generally ok then coming off the meds.

sorry if i've said anything to unsettle you,
hope you get better