I so understand your situation. I am sending you positive energy and a calm moment. I have metastatic BC.
I had my first biosphosphonate infusion in late November. I have been on letrozole for 10 months. I had a bilateral mastectomy and 6 weeks of proton beam. I was terrified for some reason. Especially since all the other treatments were faced squarely. The infusion was a breeze. It took only 15 minutes.
I have had absolutely no side effects. I am planning on it working wonders and adding quality and quantity to my life.
Have faith that you will make the right decision.