I have been in your situation many times. Does that tell you anything (Besides that I'm a raving pessimist)?
You need to go through the steps that have been set up by those who are 10 YEARS clean!!
Look man, I don't want you to have to go through what I did, so take my advice instead of learning first hand, IT DOESN'T GO AWAY!! YOU CAN ONLY PUSH IT OFF!!
I have been clean for up to a year, and all it took was the right situation and 10 seconds and I fell again.
You need a stronger defense than simply the time behind you!!!
Read the handbook and read it again, then read it a 3rd time. Figure out which steps you'll take, and get an accountability partner. You don't have to do this for life, it's just to shlep you out of the pit. Your standing with your head above the ground so you think your out completely, TRUST ME DUDE, save yourself a lot of anguish and follow through with one of the recovery programs they have here.