I realize that everyone is different in their reactions to medication and in their treatment of those reactions. I would like to share my treatment of pain and rashes in the hope that it may benefit someone out there.
After 2-1/2 years on Tamoxifen I was switched to Femara. I initially had to deal with facial rashes (which were fairly bad at one point). After trying many different creams - some prescription, I found that using hand disenfectant (alcohol in a gel base) and Rescue Cream by Bach - for the itching, helped to rid me of the rashes. (I also found the source of the rashes - a hair conditioner that I used without problems in the past).
I was pretty much pain free until about a month ago when my joints started to ache and I started to get small injuries at aerobics. I couldn't understand why, after being on Femara for 5 months, I would start to suffer pains. I thought back at what had changed in the last month. It had gotten considerably colder in December - maybe. I also remembered that I had stopped drinking my daily minimum of 2 liters water. I drank at least one 1.5 liter bottle every evening. I had to visit the restroom quite often but I think this "flushing" of my system helped to rid me of some impurities that caused my joint pains. Since I restarted my water regimen the pains have subsided. I just make sure I take my Femara in the morning so it can be well absorbed into my body (I also take supplements to maintain a healthy acid/base balance. I think this imbalance may have been the cause of my cancer - but that's another story, but please check your urine with the appropriate lithmus paper for possible imbalances).
I am not a scientist or an M.D. I can only report what worked for me. Since it's a fairly easy and non-drastic treatment, I'd recommend trying it.