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.
Some symptoms of caffeine withdrawal include severe headaches, depression and feeling sleepy. People who withdraw from caffeine too quickly may suffer severe headaches. Common symptoms of caffeine withdrawal include nausea and vomiting. Someone who is withdrawing from caffeine may suffer from insomnia.