Sounded like anxiety to me. I experience a number of those things on and off again and as far as I can tell they've always been because of anxiety. They can feel serious but it's often just your mind telling you something is wrong when it's not.

Not a doctor. Could be wrong. Just sound like anxiety symptoms from my experience.

(I'm not the person you were replying to.).

I've had similar symptoms, and more, for the past 8 months. Heart palpitations, feeling of heaviness in the chest, strange exhaustion... I admit this does sound like anxiety. However, after suffering from anxiety for two decades, I've learned what my anxiety feels like. This is different. It's like comparing grits and runny oatmeal--I can understand why many descriptions are insufficient to distinguish between them, and even how one might be able to masquerade as the other, but having had both, it's clear they are not the same.

Is this after you had Covid? I've never been diagnosed with anxiety (though I have had pretty significant panic attacks around family) nor have I had Covid. I only started feeling these particular things since Covid became a world-wide event. Maybe it's a particular kind of anxiety caused by isolation?

So maybe I'm wrong and I haven't been experiencing anxiety when I have these symptoms. I agree it's a bit different than having a panic attack in my experience.

I have anxiety and asthma that are well-controlled and I’ve never been afraid or worried about COVID-19. I got sick last March for four months with severe symptoms that were described above. I was having many anxiety and asthma attacks with no obvious cause.

I still haven’t gotten fully back on my feet.

There is literature comparing many long covid cases with chronic fatigue syndrome. The medical establishment doesn't go out and say it outright, but I think the implication is that some of these symptoms may be anxiety driven.

You don't die from anxiety.

Anxiety is one of the worst possible influences on cardiovascular health:

https://pubmed.ncbi.nlm.nih.gov/26027689/

You don't die from obesity either, you die from the effects it has on the body.