I Have Been Prescribed Gabapentin 500 Mg Three Times A

I have been prescribed gabapentin 500 mg three times a day. This evening I took 5 at 8pm and at 9:15, I thought I had not remembered to take the medication at 8pm and took another dose. A total of 1000 milligrams within one hour. I realized I must have taken the second dose when I became light headed. I have drank 34 oz. of water to flush it out but also took meclizine 25 mil. for the light headedness. Should I seek medical attention?