Yes I'm REALLY careful with potassium dosing, didn't lose anything but had a negative effect ( browning & just not looking right somehow ) when I dosed according to what I saw people saying in a zeo thread. Pretty sure if I continued more serious harm could have resulted. Now I dose it, but at a lower rate than what they do in the US.
I think their dose rates are based on people using ASW that is deficient in it, but we are using NSW that already has the right amount, more or less.
I'm still convinced of the value of potassium, but in very small doses.
So what happened to you may have involved potassium, although if it did, the potassium could not be the only factor, as how you describe what has happened is not the normal symptoms of potassium overdose. IMHO it was other factors, but the potassium may have been there in the mix somewhere, or may not, who knows?