I have been on Fentanyl for pain of cancer treatment side effects & have been reducing from 400mcg & down to 25 mcg without any side effects. 300 x 4, 250 x 5, 225 x 3, 200 x 1, 175 x 3, 150 x 1, 125 x 5, 100 x 2, 75 x 1, 50 x 2 & 25 x 1. After 48 hours of last dose have been having involuntary leg movements first on left for 12 hours, a little relief & upon eating & taking normal meds, vomiting & involuntary leg movements on right side. Are these withdrawal symptoms? Do I need to go in to a doctor? I have no small dose Fentanyl left to take. Only 100 mcg doses.