I recently went through some of my old journals and found a lot of things that I simply don't remember. Some of it was as RB said - the memories were too traumatic. However, like you, I also had ECT during some of that time in the hospital and I think that may also be partly responsible for the lack of clear memories of that time.
Whatever the reason for the fuzzy memories, you've come out the other side stronger and wiser. Be proud of a job well done.