@Royalty Hi! Welcome to the forum! sorry you have to be here and what a bummer!
As this is your first posting I will ask have you made use of the resources on here and afforded yourself the opportunity to join one of the groups, say http://onlinenetwork.bcna.org.au/group/2-living-with-metastatic-breast-cancer
https://www.bcna.org.au/metastatic-breast-cancer/what-is-metastatic-breast-cancer/the BCNA website as well as the forum are a source of information, just use the search facility within each.
I guess you would already have the My Journey Kit, if not here's the link and it's free https://www.bcna.org.au/understanding-breast-cancer/my-journey-kit/
As to the aches and pains, I was on the Zoladex implant injection one every 4 weeks x 26..................bone pain was one that knocked me around. Combined with Tamoxifen and other medication the question becomes which one is the culprit. My Onc has suggested Panadol Osteo for the bone aches and it does work.
Others will come on and give you sage advice and offer comfort to know we get it, we're all in this together and here's hoping your body adjusts to the routine and the horrid side effects are a sign of the treatment working!
Take care