Very different meds.
Lexapro is an ssri, while
Cymbalta is an snri. ssris target serotonin receptors, while snris target both serotonin and norepinephrine receptors. Your post is a little confusing -- did you taper off the Zoloft, or go off cold turkey, or switch to Lexapro, or are you on both Zoloft and Lexapro and now Cymbalta? Going off any of these meds abruptly, even if you switch to another, can trigger a withdrawal, which is why I'm asking.