Morning Chest Contractions: Anyone Else?

Does this happen to anyone else: i wake up in the morning with like … chest/back contractions? Almost like mini-seizures or a tic that make me contract harshly every 20 seconds or so and don’t go away until i take my morning prozac. It’s as if my body runs out of prozac and wakes me up with withdrawal symptoms, but doctors say that isn’t possible and I’ve also gone days without prozac where i was able to control it.