If it has been that long, go back on the drug at the last dose at which you felt fine and taper off even more slowly. You were on this a long time, and your brain is trying mightily to work again without drugs. Maybe it won't be able to do so. What you have is called Protracted Withdrawal Syndrome (PAWS) and your doc probably doesn't know about this. The reason I suggest you go back on the drug and try an even slower taper is if you do have PAWS, it might go away eventually or it might never go away and there is no treatment for it, so that's what I would do if I had it to do all over again. Your other option is to wait it out and hope your brain does adjust eventually and learn how to operate naturally again. The risk is, the longer you go, the less likely it is the Lexapro will work the same and so it might not do anything about stopping the withdrawal. Sorry this happened to you. It happened to me, but my psychiatrist was a quack and wouldn't believe me so it took me a long time to learn what happened. Knowing what's happening to you is a plus, it allows you to do something about it. Also, try supplementing with a healthy dose of fish oil daily -- many report it helps at least with the brain zaps and that sort of physical symptom. But when you get emotional problems you never had before, that's a bad withdrawal to let fester.
Forgot to mention that I already do chiropractor, psychotherapy, acupuncture, physical therapy and meditation!