I've never had ECT but from what I know the amount of memory loss can really vary from person to person.
I think the most important thing, as with any medical procedure, would be to talk to your doctor as much as necessary until you feel you understand the procedure. Especially with ECT which has a lot of "mythology" around it, make sure you talk to real experts.
There was talk of it for treatment for me but in my case it was an insurance issue so I never had to really confront it. But when it came up I was at least able to speak with my therapist about it. He agreed that he thought there were still other options for me, but also spoke to me so that if that becomes an option I can deal with it reasonably.
I also know some people who say it did help them.
It sounds also like you are "not there yet" but just thinking of it as an option for the future. I get the impression you have a good relationship with your doc, and they are telling you about your options, so if you have questions discuss it with them. They should be willing to talk to you about it as much as you want.
It is also good to get opinions from others who have had it but also remember that everyone is different and responds differently to every treatment.
Good luck, and I am glad that you have options with your doctor. Hoping that the med changes will do the trick, so don't get too worried about other stuff that is only "maybe's", It it good to be informed, not good to be overworried about stuff that is only "maybe" and the most difficult of all to tell the difference
But that's why places like this can help.
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-- The world is what we make of it --
-- Dave
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www.idexter.com