Hi Jane43, I had a terrible time with side effects on breast cancer drugs, and was changed onto a different one several times when it all became too much. I felt I had to continue one way or another because it was the second time I had had breast cancer in the same breast, having had a lumpectomy and radiotherapy the first time, and then a full mastectomy and drugs the 2nd time.
I was supposed to stay on the drugs for 5 years but in the end I was allowed to stop them at 4.5 years. They triggered the menopause. One was a daily chemo drug in tablet form and I suffered 24 hour nausea every day for 6 months until I just couldn't stand it any more.
I would speak to your consultant to see if they can put you on something different that you might tolerate better.
Meanwhile I have been clear of cancer since 1998 so I'm very grateful and can look back and realise that it was worth it.
Regarding being osteopenic (pre-osteoporosis), I was in the same situation and didn't want to take the drugs, but calcium alone is not enough - you need magnesium, Vit D3, Boron, Zinc and Omega 3, some of which help with absorption of the calcium.
You are welcome to send me a pm.