This is more of a technical note but it's ECT, maybe one of the mods could change the title so that people will click on it?
ECT can be highly effective for some people and as a process it's been refined although it remains crude. They think it works by overall reducing brain activity because depression seems to cause over activity in multiple brain areas that seems to produce the symptoms...well it's not clear which comes first and my explanation is highly simplified but it's the general idea.
It's definitely effective, I don't think that's ever really been argued otherwise. I also know on an anecdotal basis it's helped a number of people when nothing else has. What I would say is thoroughly research it, know exactly what you are going into. The side effects are significant and that is where its controversy lies, not in its effectiveness.
I know nothing about Medicaid as I am in the UK.