The in between radio stations is supposed to be the same as the fan thing and could maybe be less electricity.

My therapist this week just recommended early morning/afternoon exercise, lying down when tired in the afternoon and just closing your eyes (i'm unemployed so that's possible), as little caffeine as possible and warm milk at night. I'm going through a really bad 1 hour a night only sleep period now and its really affecting my mood.

I'm sure you've tried those things but maybe it could help?
My friend who has PTSD got a dog and that helped her with the hyper vigilance she had. Trusting in the dog to alert her if there was anything wrong. Another idea.