Mike, I'm so sorry you are having such a rough time with the meds, necessitating an ER visit. It's true that most ERs are really busy over the weekend. Since your doctor recommended cutting the metolazone in half, I would do that, and also just take 1 or 2 ropinisole instead of 3. Also, your body does need SOME sodium.
How are your ears? Tinnitus is really ringing in the ears, and that doesn't sound like what you were experiencing.
I'm becoming very frustrated for you, and hope that they can figure out something for you SOON!
Mike, when is your next regular appt. at MGH? They really need to get this under control somehow.