Is it normal to cry and shake always the same leg only during absence events?

Seizures? : Please be a bit more specific in your question. Do you mean absence seizures?

Maybe for you: If only one side of one's body is affected, that makes me think about some form of a seizure. A neurologist is a specialist who could perform am examination including possible an eeg- brain wave test to rule in and rule out precisely what is wrong ( if anything) and to then commence with the appropriate intervention.