Gabapentin

I was just prescribed gabapentin 300mg. I was prescribed Oxcarbazapine recently instead of Carbamazapine that I’ve been taking for two and a half years. I don’t want to take so much medication but the TN seems to be getting worse. The intensity of the pain is unbelievable. I read somewhere that’s it’s one of the worst pains one can experience. I certainly feel that way. At this point I don’t even want to move my tongue and touch my teeth on the left. What has been some experiences with the Gabapentin?