Suggest Suitable Medication For Nerve Pain

Hi, I dont know if you have heard of the hcg diet or not but I am on it. I am also taking Amitryptiline for nerve pain. I haven't been losing weight as fast as you are supposed to and I also have gained back about 10 lbs every time I finish the hcg diet and start the maintanance phase. I know a handful of people who never gain any back after the hcg. My question lies with the amitryptiline. Is this causing me to gain weight after I finish and or making it harder to lose the weight while I am on the hcg diet?