After doing adderall (dextroamphetamine and racemic amphetamine) i have problems breathing. is this a common side effect?

Not typical: You could have breathing issues if it caused your heart rate and blood pressure to increase. You can check your heart rate at the time you feel short of breath and can also check blood pressure. If either one of these is significantly elevated you will likely need to stop. If BP and pulse are fine and you just feel tight with shortness of breath should consider an allergy.