insomnia
"My doc prescribed 40 mg at bedtime to shift my sleep cycle.  History of acute anxiety attacks w/ tachycardia, and essential tremor.  First dose I felt agitated, anxious, and my heart rate went up to 160.  It did not help me fall asleep any earlier, next day blurred vision and 'migraine aura'.  Things went downhill from there.  My doctor said to continue it for at least 4 weeks and the side effects would go away.  They did not - things continued to worsen.  The tremor increased to where I could not use the computer, headaches got worse, anxiety increased, I became irritable and angry, and my blood sugar went through the roof.  After 5 weeks I threw it away - blood sugar still high and tremor still worse after quitting a month ago."