I can relate about the tired of being tired. Before my second bypass and St. Jude's' Aortic Valve, I did develop an enlarged heart and was so tired. Did not why, just so tired. It was hard to clean my little apartment at the time. Took two days sometimes. And then when I knew, I was tired of the wait for surgery.
But my recent adventure was a mystery for over 30 years. I have found out that I have edema in both legs and weeping edema. It can cause internal infection. I went to the doctor after suffering this last time with the weeping going on forever. We did an MRI and echo of the legs. I found out more answers this time than guesses. I we relieved and we will hopefully get me in to do a Cath procedure on the legs next month. I feel better knowing what it is, and is a pain sometimes, financially speaking.
I know we feel better knowing what it going on and it does wear one out when you do not know.
Hopefully you can talk to your Cardio and ask some questions and he/she is more willing to inform you of what is going on to clear up confusion. Some Doctors do not want to talk, cause we are being more proactive on our health. They need to get used to it. We all need to be proactive and ask questions.
Have a great day. Hugs for today.