Hey sweetie,
Bless you!! There is nothing or No Thing that can separate you from your reiki healing energy. It can't be separated from you because it is Source and you are One with Source.
Start by widening your channel of Light. That should get the energy flowing again. Also self healing will help. Get into a loving frame of mind and place hands on your heart and let the compassionate Self take over.
Read your reiki manual, or go to the library and get some reading for reiki things. Immersing oneself in the energy has to help.
Blessings,
Jahnavi