Alot of congestion

I have really bad congestion. Alot of phlegm.... i went to the doctors and they prescribed me anti biotics and the nebulizer. While on the anti biotics i did drink alcohol.... so im wondering if that stoped the medicine from working. the mucaus is realllly bad and gross.... i dont have a cough fever nothing just full of mucaus! What do i do!? PLEASE HELP

Is it asthma related or something else?
Sometimes acid reflux can cause a lot of phelm in your throat.
Joy