That is not normal, sounds exactly like the feeling you have when an enemy is draining your energy.
Try closing your crown chakra and make sure you have it alligned correctly. The crown chakra should look like an upside down piramid pointing straight down towards the sixth chakra.
Try to feel where this energy is going to, it never just flows into nothingness, something is taking your energy and by following the flow you can find out what it is. After you find what it is you can destroy it by projecting your aura as blue fire. Ask Satan directly for help if asking your GD doesn't seem to work.
It might be that an enemy is disguising itself as your GD. In this case whenever you ask for your GD you also create an energy bond to this entity, so asking Satan directly should work better.
Also try pulling this energy back. Something is sucking this energy out, but you can reverse this flow and pull it back in with your will. This is what I do when the enemy tries to suck my energy out, I suck it back in and blast them with my aura.