@resort, I'm sorry you're going through all this, but fear not, you will probably have a wonderful life ahead and many good things to look forward to even though it's so hard to absorb the things that are happening now. I speak from my own experience because I was diagnosed with breast cancer at age 49 and now 25 years later I have pretty bad osteoporosis. That said, I have led a beautiful life since that diagnosis and there's more to look forward to now. These diagnoses are not the end of a happy life. It just takes a while to figure out how to get through the things we face. In terms of strontium, I tried it many years ago and found that my bone density scores went up when on it, then plummeted when I stopped taking it. The research on it is still inconclusive. Here's a link with more information. https://americanbonehealth.org/medications-bone-health/why-strontium-is-not-advised-for-bone-health/
There are many other things you can take, aside from medications that can help your bones. Some of them are posted in this stream. Good luck to you and don't give up hope!