Hi Alanr,
I have experienced similar issues to you. I was diagnosed with Myeloma in October 2018. In February 2022, I noticed breathlessness/ chest discomfort when walking up hills. My CSN suggested that I speak with my GP, who referred me to my local hospital with possible Agina. I eventually had a CT SCan of my Coronary Arteries. The scan showed that I had some furring of one of my Arteries, but no more than she would expect for a woman of my age. I’m 72. So no confirmation that I have Angina, or that my symptoms are due to the Myeloma medication. However, the cardiologist, has suggested the I take cholesterol tablets, once the trial I’m on is over. So I still don’t have a definite diagnosis ! However, I do have a GNT spray…..just in case.
Best wishes, Terry