I think in order for it to be a relapse, you have to be sober in the first place. Sounds like you're struggling with that part.
Since you've gotten out of treatment, have you followed up with any type of recovery program? Alcohol is my drug of choice, but I've heard great things about NA. Face-to-face time helps me a lot in my recovery, as does checking in here on a regular basis.
Best of luck to you, and welcome. There are lots of great people here with tons of experience and support to share with you. Hang around for a while; I think you'll be glad you did. You may also want to check out the Substance Abuse forum:
Substance Abuse - SoberRecovery : Alcoholism Drug Addiction Help and Information