If you have been on Lexipro that long and are not feeling much benefit, then I would suggest that is not the drug for you.
I have had 17 years experience trying different ones, and it IS a bit of a trial to get one that suits even most of your requirements.
I can say , however, that just sleeping enough is a MAJOR way to help with your memory and any problems with concentration. You may benefit from a sleeping pill, even more than you do from an anti-D.
Up until 6 months ago I was working all day and all night sometimes because I just could not sleep. It was literally cracking my mind up.
I improved greatly after they gave me a sleeping tablet that was a teeny bit stronger. In fact, like I said, I seemed to get more benefit from the sleep than from the anti-depressants.
Does Lexipro have a sedative effect? You may want to ask your doctor to switch to one with a stronger sedative effect ..