There is a questionnaire called the Alcohol Use Disorders Identification Test (AUDIT) which is a standard tool used by health professionals to look at a person's Alcohol use, which you can find here
http://www.patient.co.uk/doctor/Alcohol-Use-Disorders-Identification-Test-(AUDIT).htm
Although the most important indicator you could use is whether or not you feel that Alcohol is really causing you problems...
BTW I scored a 6 which indicates a "possible risk" but is still within the "normal" range...