Methadone is the most successful method of treatment for opioid addiction in use today, and can be a lifesaving treatment. I too was addicted to
hydrocodone, for twenty years, and went through many abstinence based rehabs without success before trying methadone. I have not felt the need to use drugs or alcohol since my first day at the cliic.
Many opiate addicts who have had heavy, long term using histories sustain permanent damage to the brain chemistry, meaning that their brain does not produce endorphins (the body's natural opiates) any more, even after a long period of abstinence. Methadone has been compared to
insulin in that it replaces an essential bodily chemical no longer being produced, and thereby stabilizes the patient so they can live and function normally.
Methadone has a long half life, so it does take longer to taper off than with other opiates. However, that very trait is what makes it so useful for addiction treatment, as it keeps the blood levels in a steady state for 24 hours without causing euphoria or a "high". It must be carefully monitored during the induction process,, and not mixed with other drugs. However, it has been safely taken for many decades by opioid addicted individuals with a tolerance.
I would suggest that, since you are on a low dose, you might try switching to
Suboxone. This is a lighter medication and works well for many people with pain pill addictions.