I took 20mg. Cymbalta for 9 yrs.The last yr. I switched to generic. Symptoms came back: dizziness, heart palp .,no appetite, headache. I weaned off and things got worse. I have lost 17 lbs. I went back on brand name 20 mg. Some days are ok and some are bad. It has been nine days.I just want to feel normal. I have to return to work in the school system in a month.