Thanks for sharing your experiences.

It doesn't really feel exactly like drowning for me, but I absolutely get it. I'd describe probably/maybe something similar as suffocation, lack of oxygen.

I also can't cry. I wish I could (a little). I used to (be able to) cry a lot during depression.

If I don't sleep, I get quite extreme hypersensitivity (more than the rather mild one I always have with severe depression).

But if others want to share/describe their experience, please do. It might help just to describe it, I think, concentrating on that rather than toxic thoughts making things only worse.