Maybe something else. If you are feeling alright now, you do not need a CT scan. If you are sure it was a seizure, you should first visit with a neurologist, then perhaps other tests would be helpful. For seizures, blood tests, MRI and EEG are helpful. But what is a mini seizure? That is important too. Avoid k4/k2. That stuff causes odd symptoms. Stay away.
Probably not. Talk about it with your physician during your next annual, or make an office appointment should something like this recur.
Couple of things. First, don't smoke bizarre chemicals. Second it's not clear what you're calling a "mini seizure," so (third) it's hard to recommend any specific test or treatment.