ALCOHOL AND PROPRANOLOL INTERACTION.

I'm an anxiety patient foe the past 3 years and also hoing through a little bit on alcohol dependency. I take a medicine called etilaam pro (etizolam 0.5+ propranolol 20mg) twice a day which helps me with my anxiety. Recently I noticed that whenever I drink alcohol my heartrate goes upto 120 and i got kind of scared. Met a cardiologist and he performed all my tests such as ECG, Streas Echo, CT calcium scoring, everything came in normal. He told me that on the days when you drink, rather than taking etilaam pro in the evening take 40mg plain propranolol 2 hours prior to drinking and it will help you with your heartrate.I tried it and it actually worked, it kept my heartrate below 90 for the whole session without any complications but i'm doubtful if i should do this again or not. So I really wanted to know if taking 20-40mg propranolol before or after drinking alcohol safe?