Had 3 emotional/nervous breakdowns @ school (crying shaking hyperventilating) should I tell my therapist and psychiatrist? History: G.A.D Depression

Yes. Yes, you should tell both and see your psychiatrist for help with your medication while you work through with your therapist the things that led to these breakdowns. One thing to bear in mind is that being a teen in high school is emotionally stressful for everyone, you are not alone. Work with your therapist to develop tools to handle stress and to identify your triggers.