Should I go to a methadone clinic?

I am not an addict I have chronic esophagus spasms and my GI is referring me to a Pain specialist but the pain clinic cant see me until the 20th of this month I have been pn pain medicine(vicodin,oxycodone) for 3 years because of these spasms my question is should i see a methadone clinic until i can get seen at the pain clinic or will that mess me up will the pain clinic not see me because i decided to go to a methadone clinic because of it?