Amitriptyline and weight gain

Hi everyone just wondering if anyone has any advice on weight gain with this drug I’ve been on it for about 6 years my weight has increased by 1 and half stone. It doesn’t matter what exercise I do my weight doesn’t change. The weight seems to have gone on gradually,I’ve been reading about side effects and weight gain has came up a few times. Can I ask what anybody else takes for pain relief I’m thinking about speaking to my doctor about conning off or changing meds. Thanks x