Falling down episodes

I'm a 23 year old female with a history of Asthma, hypothyroidism, and epilepsy. I specifically have complex partial seizures of the left temporal lobe. I've recently been having episodes similar to fainting but with no warning, immediate regaining of conciousness upon hitting the ground and little unpleasant feeling after these episodes. They have been suspected to be atonic seizures, but yesterday in the ER the doctor said that my CK level was at a level of 29 and was actually *low* when it would be high if it was an actual seizure. My question is, if it was an atonic seizure and there was a lack of muscle tone during these episodes, should the CK level actually be high? This doesn't make sense to me.