When I saw your question I thought it was my original question brought back to top of forum. I just went throught the same thing with my cat and it was a long process. Here was the treatment: 5 days of metacam, then 2 weeks,3 times a day of 0.1ml bueprenorphine and 3 weeks of Gabapentin.After the initial 3 weeks ,the Gabapentin was given for a longer period of time with reducing dosages. Dosage is all relative to age and weight of cat and also kidney function. My cat had a real hard time dealing and had frequent pain outburst. I can't say for sure if it was all the meds or time or both, I do believe Gabapentin made a difference but everything seemed to work out. He is back to himself running around, he still tries to use the missing leg and he does twitch often but no more visible signs of pain or fits. He is more sensitive and protective though now so he is less tolerant of our other cats. I know what its like, it was hard seeing him in pain but we both worked through it and it was a few weeks after surgery before the crying and hissing stopped. Each cat is different but it should get better. Good luck