@waterlilies1899, have you heard about a specialty called cardio-oncology?

Mayo Clinic offers expertise in addressing heart problems (called cardio-oncology), potential or current issues. The Cardio-Oncology Clinic (https://www.mayoclinic.org/departments-centers/cardio-oncology-clinic/overview/ovc-20442193) evaluates people prior to cancer treatment and patients who have experienced side effects due their treatment.

You might ask if they have cardio-oncology as a specialty where you receive care. Whether caused by chemotherapy or treatment exacerbated an existing condition, I'm glad you are under the care of a cardiologist.