At one point I went three months without doing any and I was completly out of it the whole time. It was hell, when I'm not high on opiates I can not function at all. When I wake up I don't worry about eating I worry about this drug, also its been a gateway because when I cannot get painkillers I have to get opiates that I would have never even been around a year ago.
I wish you would consider quitting opiates altogether. Methadone and Suboxone are both opiates that are actually what is better called "substitution" treatment, not addiction treatment. You are actually just getting a legal, prescribed form of an opiate. And Methadone is far from benign: because of its extremely long half -life, methadone is one of the opiates that’s most difficult to detox from. Any attempts are usually so prolonged and excruciatingly painful, that most addicts are not able to go through with the experience and give up. Methadone "addiction treatment" becomes a lifestyle in most cases.
You are far too young to be trapped in that lifestyle. You are certainly right to be concerned about you liver that should be checked as soon as possible. Please look at my blogs that talk about options for detox by clicking on my name in blue and please check out my clinic's website as well on my home page. Please take this very seriously, I am worried about you, can you talk to your parents and get them to help? Your life is only beginning, you have so much ahead of you, please do not give up.