What's your opinion on this...

I took Zonegran 2 years ago as a preventive, and it worked very well.  I was weaned off of it because my migraines stopped, and I haven't had any until this month.  I have had 6 migraines this month.  All are triggered by exercise.  My new doctor told me to drink more water and take Ibuprofen.  We also talked about a preventive medication.  I told her that Zonegran had worked very well for me, but since she wasn't familiar with the medication, she prescribed Neurontin instead.  But she wanted me to take Ibuprofen for a week, and then if I still had migraines, to start the Neurontin.  She wouldn't tell me about side effects and told me to ask the pharmacist instead.  I'm not too thrilled about the potential weight gain.  I also read something about gradually increasing dosage, and she never mentioned any of that.  (I had to increase dosage with Zonegran.)

I'm just wondering if anyone out there has had trouble with their doctors.  Can't patients ask for a certain medication if it's worked in the past?  I tolerated Zonegran well, but I feel like I'm going to have to beg my doctor to prescribe it. 

Any suggestions?