Welcome Princess
I am sorry for this pain at what should be a happy time of your life. As you already know, living with an active drinker or addict brings with it a lot of problems and pain, and only you can decide if you want to stay or go. And you are both probably wise to hold off on the marriage until you have worked through this.
If you'd care to stop down to the Nar-Anon or Al-Anon forums, there are many there who have been where you are, and who would be happy to share their experience, strength and hope with you. On the main page just look down a few forums and you will see it.
I'm happy to have you join our SoberRecovery family and hope you find some strength and peace here walking with us on our road through recovery.
Hugs
Ann