@MoiraC, sounds like you are going through a bad patch right now. I was on Femara for 18 months and my husband would just watch me as suddenly it looked like I had had a bucket of water thrown over me. I'm now on Aromasin and the side effects aren't as bad yet. What gets me through everyday is having something to look forward to. I always have a little trip away booked.
When the side effects got too much for me on Femara, I had a two week holiday off it. I told my oncologist and he was fine with it. It did me the world of good. That was my personal choice though. Take care.