Asking for a Medication Adjustment

I'm seeing my doctor (PCP) on Tuesday and I'm very excited to, since I've wanted an appointment since January. I want to ask her for a higher dosage as I'm on the minimum right now. She's also not the doctor who initially prescribed me it, so I'm a little worried. I would have to ask her to 1) take over the prescription and 2) give me a higher dose. still, I really want to do it. Wellbutrin has worked very well for other people in my family, and even though it's not super effective yet, I'm happy with the lack of side effects on me, so I want to give it a shot at a higher dose. Zoloft was kind of a nightmare. B:|