Hi I,m 63 Yrs Old Had Degeneris Disck For Several

Hi
I,m 63 yrs old had degeneris disck for several years and i cant not be operate so my neurologist suggested i use medication which i found dilaudid to be the right one for such 1 mg ...2...3 mg when needed however they are trying to stop my medecine that is working perfectly and i do not have any dependency since i could take 8 a day and sometimes i take none however i do need them for my daily routine so why my doctor wishes to change my medication that worked 7 years for me and without and side effects