I have been on Gabapentin for a couple years now and am taking 3600mg a day. The only side effect I notice is weight gain (it makes me hungry all the time) and sleepyness in the late morning and afternoon. But then, I have an extremely high tolerance for meds. In 2004, I was taking about 8 Vicadins (7.5/750mg) a day for months (and working and driving) before a spinal fusion and quit the day my surgery was done. No WD. I am lucky in some respects and not so lucky in others.

I would follow the advice mentioned prior and hope it works for you.