I can only suggest that you do a 'web' of 'potassium deficiency' and read what's out there to determine if things 'click'.
Problem with this all is that there are a lot, LOT of well, less than reputable sites there when I did a search. While some have merit? Many propose that 'doing it a certain way', meaning: following my 'recipe' will cure you. That is usually not the case?
Have you had, recently a blood test called a 'full metabolic profile'? That is the test that tells ME at least, that I've not, or, enough calcium, thiamine, B-vites, and magnesium, plus the slew of other things we need to exist, and ideally properly.
I also suggest that you read this article:
http://www.aafp.org/afp/980215ap/poncelet.html
I have found it to be the best, most clearly put, outline of how a doctor decides what else to test for. Essentially why they decide to go so far, and no further. Sad but true it is that many docs do not go that extra mile to find out further-or, rule out further other causes. But, lots of those 'others' are presented/put out in this article.
Yes, it IS like learning a different language! Essentially because it IS! Keep in mind, tho, when dealing with the squirrelley variables we all have in PN issues, and all the variables that can and do come into play-that it IS up to us to learn this language? I know I'm not language proficient, nor have an ability to deal with it. But I've wrestled with that and the chemistry aspects simply because I means getting treated and getting a life or not! That's great motivation in my book.
Hugs and hope! Don't be afraid to ask questions tho...none are too silly or stupid. I for one, have had far more than my share of "HUH?" moments, we all do, at times others here can put things in more simple words that make sense than I can.
Have faith - j
's