How many drug holidays per year on AI drug?

I've been on Exemestane for 3.5 years. I've had to go on at least 2 drug holidays a year (2 weeks long) just to rest my body from the muscoskeletal pain.

I'm wondering why all of a sudden my body starts to hurt painfully everywhere: hips, knees, fingers and I cannot cope. I can barely get out of bed. I've already tried Anastrazole early on and it's worst.

During these painful episodes, my oncologist lets me go off of it for 2 weeks and then resume Exemestane again.

I'm wondering what's triggering the painful episodes? Does anyone else go through this periodic muscle and joint pain?