Having read your description regarding the problem in your child, there are 2 important disorders that come to mind. Although there are many causes for reeling sensation, I would suspect that your child is probably suffering from Acute Paroxysmal Vertigo, which is a type of migraine in small children. This is a benign condition that improves over time or may develop in true migraine. It would be important to see if other family members suffer from episodic headache. A type of minor epilepsy called vertiginous epilepsy seems very much less likely. With this information, I would suggest you meet a neurologist who should be able to differentiate between the two.