I was on anastrozole (Arimidex) for about a month and had headaches 25 days and then none for 5 days. Then....Boom...horrendous headaches, nausea, sweats,, fevers, extreme weakness, etc. but found out that it was from a bacterial infection and diverticulitis. My oncologist has told me to go off of anastrozole for 2 weeks and we'll talk again then. I probably had the infection for about 2 weeks before seeing my doctor while blaming the anastrozole for all the side effects! Now that I'm off of it, I've noticed more bone and joint pain and sweats which I think must be withdrawal from it. The joint pain I had from the AI had been managed by 5,000 U of vitamin D3. So I guess I'll find out what's really what once I get put back on whatever it is I have to go on.

@sparklegram @francine6829
The big difference (to me) between Aromasin (exemestane) and the other AIs is that Aromasin is a steroid; and, although it has similar side effects to the other AIs, there is a more commonly reported issue of insomnia with it.