I've experienced similar, although I ended up switching from citalopram to fluoxetine. I've woken up crying, punching the shit out of the pillow next to me (luckily sleep alone), screaming... the dreams are visceral. How many times I've woken up and felt the sheets because my entire body had the sensation of taking a huge piss in a dream, that intense feeling of relief.

Never got withdrawal symptoms from the first round some time ago, unless you call a second bout a withdrawal. Sleeping at night has become a bit of an adventure.