Foreman got it early on[]
At 14:03 in the episode, Foreman asks "What if it is something environmental? Arsonic, mercury,...". I was later revealed the final diagnosis was cadmium poisoning, a form of heavy metal poisoning. --MrHacks (talk) 17:24, August 25, 2018 (UTC)
Increased potassium levels[]
Increased potassium levels don't rule out Addison's since Addison's is adrenal insufficiency therefore decreased aldosterone causes hyperkalemia, which is consistent with Addison's.