My prescription was put up from 75 to 100 in february this year. I felt much better until the last few weeks, when I started to feel panicky, sweaty and weak. I have noticed that the 100mcg and 50mmcg tablets are made by Activis and the 25mcg tablets are made by Mercury Pharma. So when I was taking 75mcg, I was taking a mix of Activis and Mercury medication. I have been using up the 50s and 25s up to the value of 100. Since I have started taking the one 100mcg tab I have started to have these unpleasant symptoms. Could the change in drug manufacturer have an impact?