Though I've never been on an anti-depressant, I've been on Gabapentin/Neurontin for my nerve pain & had to go through similar symptoms with withdrawal. Flashing in front of my eyes, vertigo, nausea, headaches, tinnitus... Other than the flashing, I usually go through those things anyway! But it can feel crippling when it's related to withdrawal. Mine went away in a couple of days, but I wasn't on it as long. I hope you feel better soon!!