ECT has been a contentious issue for years. What does an electrical shock actually do for depression anyway?
I guess it is sometimes seen as a last resort by professionals. Depression is a combination of a state of mind by rumination that causes lack of REM sleep that then causes a lack of neurochemicals Serotonin and Dopamine and Ephinrephine (adrenaline)
To get back in balance a good diet, medication, a determined mindset are very important factors to getting better.
Exercise is essential and keeping busy as much as you can. People do overcome depression. I have 2 serious bouts of depression in the past 10 years.
Best wishes

Chris