I was thinking about you and Shiloh for most of yesterday. I am so glad that you have seen a better vet and this one definitely sounds as though she knows exactly what she is doing.
Gabapentin and Tramadol are only two of the cocktail of medications which can help to ease Shiloh's pain. As has already been said, there is a variety of combinations to choose from. Think positive and take each day as it comes. Rebel's symptoms were sudden and distressing for both of us, but trial and error coupled with a large helping of patience and flexibility has taken time but worked wonders.
Sending hugs to you both.