Definitely call the pharmacist. I'm surprised your doc didn't give you specific instructions on how to take it. Usually, you take the most amount on the 1st day and least amount on the last day, so you don't get the rebound effect. Definitely spread the dosing out through the day. I was written an rx for 2 weeks but couldn't tolerate it for more than 2 days- I was way too agitated!
Hope it helps you-