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Published 14:45 30 Dec 2013 GMT
Updated 06:35 18 Dec 2014 GMT

Matt is determined to kick this habit before his tour starts in April of next year
"In order to calm himself down he started taking Valium and then temazepam, but things got so bad that he couldn't get up in the morning without taking pills.
"He began to realise he had a problem and decided to do something about it and get clean before his tour."
Matt is siad to be determined to kick the addiction before his UK tour starts in April 2014.Explore more on these topics: