I took Accord brand name throughout my five years. Dry few side effects some loss of hair trouble with dishes but the. That has always been a problem. Otherwise found it to be totally bearable

Everyone reacts differently to even identical drugs. Your reaction could, as you suspect, be due to a different generic. However, my side effects appeared slowly over several months. It could be just coincidence of timing that your side effects appeared with your refill. I was on Letrozole for 9 months with nothing more than hot flashes. I discontinued for 7 months while having chemo and radiation. Then my oncologist switched me to Anastrozole which took about three months for me to notice the joint pain and other effects which eventually got quite severe. After 14 months I went back to Letrozole, started collagen which relieved most of the joint pain, but other side effects continued. Four years later and learning so much from this site, I now wonder is it the drug, the manufacturer's formula, or maybe even the Prolia for my osteopenia? There are so many variables. Hope you get some insight somewhere that helps.