Cymbalta is used to treat major depressive disorder and general anxiety disorder. It is also used to treat a chronic pain disorder called fibromyalgia, and to treat pain caused by nerve damage in people with diabetes (diabetic neuropathy).
Caffeine-withdrawal headaches can last up to 48 hours and can be as intense as a migraine headache. Withdrawal symptoms can begin 12 to 24 hours after the last cup of coffee and can last up to 1 week. These symptoms can include lethargy, extreme nervousness, irritability, sweating, headaches and shakiness.
Caffeine has a half life of 12 hours, 1 cup of coffee. Even if you do not notice the effects, it is still in you system. Withdrawal means the body is returning to it's natural state before the caffeine. Headaches are a common and probably the most difficult symptom to deal with. Feeling tired, irritable, maybe aches, slightly if not greatly lethargic. The range of symptoms can depend upon the length of use and the individual's health.