Calm down dude.. worrying is only gonna make u have a heart attack. Drop the Niacin it wont help u pass this test and will only make u uncomfortable. Buy some metamucil and follow the maximum recommended daily dosage. Running and sweating will help u but u don't need to go over excessive on the water. Just keep yourself well hydrated. The only way to know if your clean would be to buy a home drug test. Ebay sells for cheap or u could pick one up at Walgreen's or Walmart. Test yourself in the morning with the first void of the day. Keep following your regimen and read the dilution sticky. Keep us posted and good luck!:thumbsup: