Hi tre
Like you I broke bones in my fifties (shoulder and wrist) and had to pester to get a DEXA scan. It showed I had a problem with osteoporosis but like you, I tried, and could not tolerate, alendronic acid and bisphosphonates.
So....to cut a long story short, I now have an injection of something called Denosumab, once every six months, and take calcium and Vitamin D. It's apparently expensive, and doesn't suit everyone, but I've found it so good, I thought I'd mention it.
I'd love to ride a bike....but in the circumstances, I still won't take the risk
xx