I agree tell him you've had a bump in the road but everyone has those. And I also agree he needs to understand that ECT is for emergency and last restort when nothing else is helping. And, you've been up and down but not the way you were before. Do tell your pdoc you can't afford it every time you have a minor cycle. And then, perhaps have your pdoc explain that to your dad.

I know from experience that my dad won't listen to me, because in his eyes I'm still just a little girl. But if a doctor tells him the exact same thing, oh well then it's gospel truth. (And he won't give me credit for having known it first. )