anyone have sleep apnea and related heart enlargement?

Have had sleep apnea for years and have used CPAP for 15+ years. Was recently diagnosed with severely enlarged right atrium and ventricle, as well as left atrium. Left ventricle only mildly enlarged. My cardiologist says it's from my sleep apnea. Had a "nuclear" stress test and did ok. My cardiologist is not very communicative or helpful. He told me there is nothing that can be done except heart transplant, and that I ain't going to get one. I'm 65 with several other health issues, so fair enough. And yes, a new cardiologist is on my Christmas wish list.

I understand cardiac arrest due to stretched heart muscle and resulting rhythm problems can happen. I suppose CHF is likely at some point also. Does anyone have similar problems and would you please share your insight. After all, Santa won't likely bring me a new heart doc.........I've been too naughty.