Hi! @sickgirl
We all react differently. When you are feeling so crappy perhaps you should ask is there an alternative to try. I did 6 months on Femara/Letrozole and my Onc was happy to change me.
It's about trying to find a way to cope with ongoing treatment.
Do you see an exercise physiologist as that may help? I was introduced to one that cares for cancer patients and it helped to manage some of the aches and pains.
In Victoria there's a program called Ex-med Cancer
https://www.exmedcancer.org.au/Maybe this link from the BCNA website may help
https://www.bcna.org.au/understanding-breast-cancer/resources/podcasts/episode-11-exercise-and-breast-cancer/Take care and best wishes and hopefully you will find what suits you best