You probably didn't do a lot of damage to your weight loss, but the reason for no alcohol is to prevent tissue damage to the surgical sites. Alcohol can cause erosions and ulcerations - even years later. I know everyone makes their own decisions, but personally, I think it is best to avoid alcohol forever after WLS. I am a GI nurse and the worst ulcers I have ever seen are in WLS patients who started drinking again. It is pretty horrible. These tissues seem to remain fragile forever, and we need to do all we can to take care of them.
I gave up sugar because I don't want dumping. I gave up coffee and alcohol because I don't want ulcers. Gave up soda, as I already had fatty liver disease, and soda contributes to it (diet as well as regular.) Gave up simple carbs because I don't want to be fat! BUT...... got a whole new life that is so precious and worth taking care of.