My next question is: How did you arrive at that dosage? Did you take 300 mg the first day & jump another 300 the next day or something like that? If so, no wonder you zoned out! I tapered up slowly at the beginning, 100mg a day, and even then had a "high", when I hit 300mg daily, that wasn't enjoyable to me, but it started to fade after an hour or so. I had another one a few days later but was only half as strong as the first one. Now I can jump my dose by 300mg a day with very little "high" effect. If you raised your dose any faster than 100mg a day, I'd ask you Dr to taper you up slowly, maybe even moving up 100mg every other day, to get you where you need to be. It certainly was a "high" unlike anything I ever had from alcohol or marijuana (in my MUCH younger days), and definitely not enjoyable. I've seen pages here on the web about some Nuts who save up their pills to take them all at once for the "high". Now that's desperation!

Don't be afraid to ask your Dr about a slow taper. It's not likely he's ever had your experience OR personally taken Gabapentin & shouldn't give you a hard time about it. If he does, there are other Dr's out there.