I was on 30mg/day diazepam and 3.4 grams (yes, grams) per day of gabapentin. Went to jail and cold turkey'd all of it. I went mentally insane. Diazepam combined with gabapentin w/d caused full-blown delerium, hallucinations from dreams I would act out. I thought my family was dead. I thought the Outlaws biker club was after me. People thought I was nuts. I would recommend a relatively short taper on the gabapentin and it should be okay. I went back on the gabapentin at 1.2g/day and after 4 months quit and I had no w/d symptoms. I think a lot of them are mental. Everybody's different, but it sure wasn't bad for me (by itself.) Couple it with a GABA-a drug like Valium though, and whoo, you're in for a ride. Just take it easy. Mind over matter.