I just snorted 15 mg of focalin (dexmethylphenidate) and drank a 5 hour energy. should i be worried?

About what?: Physically, beyond getting high and maybe damaging your nasal membranes, you probably will be fine as the stimulant wears off. On the other hand, anyone who does these kinds of impulsive, potentially self-injurious behaviors should worry about their general safety and make sure that some responsible adult knows what they are doing with an eye towards protecting themselves from self-harm.