weed before bed inhibits rem/dream sleep. when you stop, the brain gives you the saved up rem sleep and vivid dreams.

the rest are classic anxiety symptoms. i wouldn't focus as much on the weed as on what is troubling you underneath.

Seriously, working with a therapist to address the stress, abuse, trauma or whatever else will help quite a bit and the weed use will take care of itself. good luck and trust that your issues are resolvable!!!