Feeling sick after taking adderall 30mg?

i started taking aderall last friday and it was 35mg and i felt fine and stuff and didnt eat or anything. then i took another one on sat and again i felt fine. i didnt take it sunday. today is monday and i took a 30mg adderall at like 930 this morning after eating a pop tart. i've felt fine all day up until about 5pm then i started to become nauseous. i still feel really sick. why is this?? and can is it okay to take a 1 mg klonopin now ??