It matters and you matter
The info you’ve shared here is helpful to everyone who reads it
I am too a long covid 2.5 years sufferer and I can understand some of what you are experiencing
It is very frustrating and lonely in the post covid landscape
So many tests don’t come out as providers are used to and they often also become frustrated and may inadvertently be dismissive of people’s very real debilitating symptoms
I think your assessment is right that it’s not predominately a heart issue it’s many tissue alterations due to covid impact on those tissues. From what I have learned from this site and reading papers from online medical libraries, the heart changes can be obvious myocarditis but more often in long covid are related to micro vascular changes to the endothelial lining of the blood vessels that cause changes to their thickness, permeability and lose some tone of structure. This can cause leakage into surrounding tissues and a cycle of inflammation and the chemicals that the body releases to deal with the inflammation. It is possibly a repeating cycle with new exposures to either covid or other substances that our bodies see as foreign now. So it’s like a cascade and the body tries to correct but the immune system
also is out of balance and can make an over response
Hopefully they can tell if something similar is happening in the lungs AND offer some relief