Side effects of concerta

Hello! I was diagnosed with adhd by a psychiatrist after a 4 hour long analysis about a year ago and was prescribed with concerta but I have only recently started taking it. I’ve noticed that while I do gets LOADS of things done while the medication is in effect, I also have some side effects, or feelings that I wouldn’t think someone with adhd would have. I find that when I take the medication, my thoughts start to race, my hands shake, and I become restless. Like I said, I do get more productive during this time but I’m also confused because I thought adhd meds were supposed to calm you down a little bit and help you focus? Sometimes I feel like I could bounce off the walls with motivation and almost feel a little manic. Is this normal? Or was I misdiagnosed and my adhd could be something else?