Insomnia since miscarriage

Amber • Officially a momma to a beautiful baby boy and 3 pups 🐶 💚👩🏻‍🍼👶🏻
Has anyone ever experienced insomnia after a MC
It's been 3 weeks and even though I've started hard workouts at the gym + work I still don't sleep.. I'm averaging out at 4-4.5 hours now. 
I figured once I started working out I'd be tired enough to sleep a full night.. 
 Can't take any vitamins or supplements till I get my follow up blood tests 😞