I have taken ECT, several treatments. I DO NOT recommend it.
They say you loose only short-term memory and it comes back, no problem. Not true. I underwent MANY treatments and I lost both short and long term memory. I forgot my children's birth dates, where my mom lived, my sister's work, many people I didn't remember, I also forgot my own wedding and the first years we were together. Currently, and this is after almost a year later, I still have trouble remembering things. My short-term memory just hasn't returned and I can't hold new information very well. I even had to give up going back to school to get my paramedic license. I am now also 100% disabled and was approved for SSI in Jan. Not all of that is due to just the ECT, I was severely depressed with anxiety issues, social agoraphobia, etc. BUT, it did push the disability over the edge so to speak.
Do your research, talk with others as you are. I pray you find something that works for you, I know the struggles of deep deep depression. I'm sorry you're there, but there is hope. Just keep swimming!!
While I understand everyone is different and may react differently, I don't think it's worth the risk. There are tons of meds and mixtures of meds that can and will eventually work. It's taken a long time, but I think we've found it. I don't like the term "treatment resistant". To me, that's just a cop and your dr's throwing their hands up saying "I give up". No, there is SOMETHING that will work. Use up ALL those avenues first before ECT.
If you have questions or whatever about it, please ask, I'd love to give you all the information I can.