I realised gapapentin causes slowing of my mind which is not good for my work can this med cause permanent cognitive decline/issues if taken long term?

No: Gabapentin is an analog of GHB (gamma hydroxy butyric acid). Ghb was demonized as "the date rape drug, " but was in reality the safest, most non-toxic, non-habit forming sleep- inducing substance known. Gabapentin shares many of the effects of ghb, but is less potent. Reduce your dosage during the day, to a dose that does not "slow your mind." take higher, sleep-inducing doses at night.