After being discharged from hospital give yourself a while, couple of weeks, to really settle back into where you are now. I find that putting the radio and a light on after nightmares helps to settle. Were your medications changed?

If I am unsettled when trying to go to sleep I put the radio on very low.
I also tell myself about my surroundings over and over to pull myself back to reality.

It not easy... but you will settle back in. Be kind to yourself. Tell your Therapist about things if they dont get better.

Take Care of Yourself,