It is not at all likely your problem is due to citalopram. With Citalopram (Celexa), experts estimate that it can take up to 10-14 days for the drug to fully leave the body. So there has been none of that medicine for longer than 4.5 years. On the other hand, the indications for this medicine are in a population with high anxiety, hypocondria, and axiety greater than the general population. I would susggest you ask the neurologist to refer you to a neuro-ophthalmologist for evaluation. With symptoms for 5 years it is not at all likely due to a threat to your life or vision.