DI is treated by using a form of vasopressin within a nasal spray. It is usually called DDAVP. I take mine off and on because my pituitary works somedays and doesn't others. It's been hard getting the dose right, so I am usually dehydrated anyway.

If your blood pressure and heart rate is good in association with the palpitations then I don't know. That sort of rules out your adrenals. Poor adrenals typically makes your blood pressure low too. When I have heart palpitations, my blood pressure is usually ~85/60 and my heart rate is 150.

I don't know what it could be from. I'm sorry!