Sorry you're struggling with sleep. That's always been a major issue for me.
I was taking Gabapentin 900 mg (3x daily). Now I am down to 600 mg (2x daily).

It makes me a little sleepy, but I have to take more powerful medications with it in order to sleep (I always need at least one benzo + 1 sedating AP with Gabapentin). For some people though, Gabapentin by itself really does help for sleep, off label. It also helps alleviate a little bit of anxiety, but it's a matter of finding which dose works for you. It sounds like it's worth a shot. I don't get side effects from it, BTW. In my experience, it's more tolerable then a lot of other meds, but everyone's different.