Hypokalemia is hell. When my potassium is low I get anxiety, bad anhedonia, insomnia, all sorts of stuff. I think that a PFS crash has something to do with low electrolytes, just based on my past experiences and slowly figuring out what was going on. It’s a weird thing though because hyperkalemia can sometimes mirror hypokalemia, I run into the issue sometimes with “No salt” because it’s easy to over do potassium in salt form.