Is there an autoimmune disorder that would cause htn, polydipsia, bone pain, low k+, renal stones, lethargy, palpitations, etc?

Not autoimmunity: Have you got Conn's? A renal tubulopathy? A genetic potassium wasting / Fanconi syndrome? Don't focus on autoimmunity just because of the huge amount of "pop" writing about it -- an immune interstitial nephritis is low on my list for you. Low potassium is a huge red flag. Has your vitamin D been checked -- it's a very common cause of bone pain though not the rest. Best wishes.