You didn't use it in the wrong way . Convulsions or other involuntary body movements can be caused by all kinds of things. Seizures with epilepsy are caused by a synchronous firing of a group of neurons in the brain. It can be just a small part, or it can involve the whole brain. The symptoms an individual has depends on what part of the brain is involved.

Convulsions can also be caused by things like electrolyte imbalances and extremely low blood sugar in Type 1 diabetics.

I think the other poster's suggestion that it could be stim is wise. Your symptoms could easily line up with that.

Epileptic seizures are very confusing for most people because the seizures themselves are varied. Most people are familiar with 'big' seizures where someone falls down and is stiff and jerking. But there are so many more subtle ways to have seizures. A common type already mentioned are Absence seizures that are characterized by someone stopping what they are doing and staring off.. Sometimes with eyelid fluttering. These seizures last 5 to 20 seconds and the person has no memory of it.

Other interesting seizures are, for example, Gelastic seizures. It comes from a small growth very deep in the brain on the hypothalamus. When having a seizure, the only symptom is laughter that is for no reason. Another type of seizure is characterized by the person smelling an awful, indescribable smell for 2 min. Or less that no one else smells. Most people would have no idea that these can be epileptic seizures!

Anyway... Thought I'd just share some interesting information about seizures from someone in the field.