Best thing I can say is give yourself time! I still have the occasional panic attack or bad dream, but the circumstances here were very bizarre... besides being Glen's caregiver, but Glen's dad passed away shortly after Glen's diagnosis. Then in a 6 month period we lost my mother in law, my mother, my younger brother, Glen, and Glen's uncle. So yeah I'm still dealing with some mental and physical issues. Try meditating before you go to bed..if you have a smart phone, Mayo Clinic has a very nice guided meditation app. Also.. I STRONGLY advise finding a therapist that specializes in grief counselling. Mine helped me a LOT. The other important ingredient is TIME. Give yourself permission to grieve for as long as you need.
Hugs
Katie