I am on lexapro (escitalopram) 15mg and 15mg zispin for quiet a while. i still experience jittery feeling in evening time.what would cause this. thanks?

Depression/Anxiety: Sounds like you may still be experiencing breakthrough anxiety, you are already on diazepam w/ lexapro (escitalopram) & mirtazapine. I think it is very important that you follow up with your Psychiatrist to adjust medication therapy. You should also consider counselling - cognitive behavioral therapy is often beneficial.

Not sure: If it's just an isolated event, it could be almost anything that stresses out your body. Remember, for all of us, there will be good and bad days. Unless you're noticing a pattern, it's unlikely to be anything to worry about.