A:If your are getting any of the following you must quit. Else you can try decreasing and replacing caffeinated by non caffeinated ones.
Insomnia
Nervousness
Restlessness
Nausea/vomiting/gastric ulcer symptoms
Fast or irregular heartbeat
Muscle tremors
Headaches
Anxiety
http://yetanotherhealthblog.blogspot.com/2009/06/ill-effects-of-caffeinecoffee.html
