Im glad that your getting some good results from the ECT , flip side is your dealing with memory issues... I am so sorry. I don't know if something like this could help , but with memory loss from dementia ,occupational therapist are put in place with particular teaching/training/mental exercises to help build up the memory areas of the brain. Maybe that could be an option to try, couldn't hurt.
I'm sorry your hubby can't avoid making those kinda responses, it's only going to make you feel worse.