I really think that you are doing totally the right thing slowly lowering the gabapentin dose, especially when it hasn't been that successful (same with me) Crazy Hey Bonkers can happen lol, so at least you have that covered too.
It sometimes takes a couple of weeks for the cymbalta to take effect but if I were you, because things are improving for you and/or you are getting a better handle on the whole thing, maybe wait till post next injection? You never know it might not even be needed. Just a thought. If you are 'screaming' with the pain obviously I wouldn't say that. I realise that medication is very good and very necessary
especially in the early stages of a nerve/muscle problem as an often escalating problem can be halted.
My brother in law had a knee problem for a while and he referred to his pain as a friend

I thought that very strange at the time. Now I can see that this thing does become such a part of you if you can 'own' it and adapt that mindset, it does make life a little easier. Maybe that should be taught in cognitive therapies, think you may be on to something there

See, have 'owned mine and feel better allready

Being trite there, but I do think there is some merit in the 'friending'.
take care,
Helen
Fall 2008. Misdiagnosed with lumber spine problem. MRN June 2010 indicated pudendal entrapment at Alcocks canal. Diagnosed with complex variant piriformis syndrome with sciatic, pudendal and gluteal entrapment's by Dr Filler 2010.Guided piriformis botox injection 2011 Bristol. 2013, Nerve conduction test positive; new spinal MRI scan negative, so diagnosed for the 4th time with pelvic nerve entrapment, now recognised as Sciatic, pudendal, PFCN and cluneal nerves at piriformis level.