You Surly Can I Have Been Taking Methadone For 8

you surly can i have been taking methadone for 8 years, and have had no problems, now i had to find a new pain dr and he took me off of 30 mg of methadone and put me on 5mg of opana 2 times a day i am in severe withdrawal and dont know what to do .what is the comparison between the two? i'm sorry i am on disability and can.t afford this sorry to bother you.