I was started on Anastrazole. I had short episodes initially (headaches, nausea, dizziness) that would go away in a couple weeks. Pain started at about 3 months on the meds. Generalized hip and lower back aches which I could deal with but then the sharp stabbing pain that would move round - left ankle, right hip etc - to the point where even meds didn’t help and some days it was non-weight bearing. At 9 months, he said “you shouldn’t have to live in pain” and stopped for a month before starting exemestane. I take it in the evening because the instructions are to take after a meal. Not always hungry at breakfast so this is the only meal I eat on a regular basis. (Mention this because I see some take it at bedtime - is this empty stomach or taken with a snack?) anyway, still the lower back discomfort but no major pain. My main side effects are extreme fatigue that started about month 4 followed by insomnia 3 months later. I also feel weaker than I think I should - could be related to the fatigue - but I just can’t do what I used to be able to do. Currently I’m lucky to get 4 hours a night. Magnesium helped for a couple weeks but then not much. He did a 1 month medication vacation late last year and things started to improve but worsened again after I went back on. So far, the only thing offered I to stop this one and try letrozol but that seems to be the worst of the lot so declined for now. And yes, my hair is thinning on this medication.