Diagnosed with Grade 1 DCIS and with pre-existing Cardio disease wish to do mastectomy

Looking for info and experience of people with both pre-existing Cardio disease and now diagnosed with Grade 1 DCIS, has gone ahead to successfully did a Mastectomy surgery?

I am a public hospital patient, cardio team assessment of my high risk to adverse event due to general anesthetic and hence the breast cancer team decided to cancel my scheduled mastectomy surgery appointment.

I feel like I have a death sentence. Looking for supportive experience and reference of surgeon and hospital and willing to travel to where the breast cancer team has strong anesthetic and cardio support, as I just found out my Medibank fund cover cancer treatment.