Alcool supresses your ADH ( anti diuretic hormone), so u initially loose water when u drink, but the body will try to compensate by elevating its water retention. Water retention increases the fluids in your body, including blood stream volume wich increases blood pressure. So drinking alone isnt very good for your health.
Also, alcool is ethanol, wich is a poison for our body. The liver needs to get rid of it. If you take too much alcool, you may dammage your liver cells. Same shit for the aas. So yea, alcool + aas is worse then just aas...
As for the initial question, if someone never drinks alcool and one night takes a few beers, he should get drunk way faster then someone who is used to drink..it has to do with liver alcool degrading enzymes...when u drink often your body already have those on hand to get rid of the alcool....
I would look for other factors to answer the initial question...like mood, location, what u ate that day etc,.. wich can all have an influence on how drunk u think you were