Hi Erik. I have no expience with this medication, but you are waaaay too young to self medicate. My best advice is go back to your dr and explain that the current dose is only lasting a couple of hours. I'm sure the dr will be willing to work with you to adjust the dose until you find something that works. Please don't take it upon yourself to decide how much to take. It's a very slippery slope you're toying with. Trust me, I know.