When you have schizophrenia can you freak out?

Depends on what you mean by freak out. There are many different types of schizophrenia. Schizophrenia is an umbrella term for different types of schizo-affective disorders. If by freaking out you mean losing control, attacking someone, or attacking him/herself, yelling at people who aren't really there, reacting to imaginary stimuli, then this is usually caused by 2 things:

1. visual, auditory or tactile hallucinations
2. not taking medications

When a schizophrenic person takes medication regularly as assigned by a psychiatrist and receives regular counselling, that person very seldom has an extreme episode. When s/he does the schizophrenic is typically more dangerous to her/himself than anyone else although of course a schizophrenic can also be very dangerous.

It is usually wise to call an ambulance and remove yourself from a schizophrenic person's company when s/he displays highly disturbing behaviour.