I Have Been A Meth User For About A Year.

I have been a meth user for about a year. Been trying to stop. But I am having a hard time. Non the less yesterday my work told me I would have a drug test monday. I flushed everything and my last hit was at like 7:00pm and my boss called after that. I wont be clean come monday will I. What can I do. People say eating acidic foods and lowering my body's ph will spread up the process