Gabapentin for me hits weird. It's a very odd drug for me. I never really got above taking 300mg and then another 300mg a few hours later. Dizzy isn't the right word. But I had this sense of impending "overdoing" it feeling, so I never pushed it. However, I can say it does help. But you're gonna have to push past any trepidation. Hell, there are people on this site who are like "yeah man, take 2 grams, accept no substitutes." Like jesus, that just scares me. The other thing to remember is it can take a really long time to hit. For me, I've had it take like 3 hours to really kick in. And my stomach was empty. There's all sorts of bullshit about acidity and fat and how fast it absorbs. It appears as though it is processed fairly uniquely by the body, and your system can only process so much of it, so taking it all at once is apparently a waste. So "they say" to take a certain amount, and add to it every hour until you're good.
I will say it did allow me to sleep when I was in the weeds bad with withdrawals. It gave me some weird dreams, but they weren't unpleasant. I dreamt about Randy Rhoades and Randy Savage racing in NASCAR on a road course, except they were the same person and I knew this, but also knew I was conflating the names. Helluva dream.
It also can give visuals, which no one prepared me for (I had thought I had read up on it). We're not talkin like trippin balls, but it'll definitely add some sparkles and distortions to your vision, as well as closed eye visuals.
There's my 2 cents. Don't gulp 1.5g at once. Take 300mg, wait an hour, take another 300mg. Etc. Just be patient. I'm no expert, but there ya go.