For those of you taking gabapentin for anxiety, what is your dosage? My Dr. started me on 300 mg three times a day. Well the first dose was as 5:00 last night and knocked me out and I'm still having dizziness and brain fog, or it seems like pressure in my head. He called me in 100 mg. but I'm kind of scared to take it again. It did help with the anxiety a lot but the feelings it gave me made me anxious.