I take 50-60 mg a day, though lately I feeling I'm just going to stop. My NP that manages my meds just had a baby, so have been just dealing. Though it seems to do exact opposite of what it's supposed to. It seems to help mental alertness and mood for first hour. Then I'm ready for bed and getting a lot of headaches. Is this maybe a sign my brain is blocking the medication? Is this common? Been taking maybe 6months