Thank you for reaching out for help! First of all, you are not alone in this dilemma of drinking, even though you have a loving, supportive family. Many patients I see in treatment have loving families, manage to maintain their jobs and function quite well in the workplace; however, it is in their personal life that alcohol has become problematic. Your drinking is quite clearly causing you problems and embarrassment; wetting the bed and the couch is also common for problem drinkers.
Let me give you some hope and encouragement: alcoholism is a disease that is very treatable. Please be honest in asking yourself the following questions:
Do I drink when I've promised myself that I will not drink?
Do I drink to escape my feelings?
Do I participate in behaviors when under the influence that I'm ashamed of when sober?
Do I choose partners that drink as 'drinking buddies'?
If you answered yes to any of the above, I would recommend that you attend an Alcoholics Anonymous [AA> meeting. I would also recommend this based on the progression of your drinking, e.g. buying wine and gorging yourself, bed wetting, experiencing shame and low self-esteem. You can call your local AA Central Office, find a meeting to attend, raise your hand and introduce yourself as a newcomer. You do not need to identify as an alcoholic; the only requirement is to have a desire to stop drinking. Try it for just one day.
Another thought is to find an addiction counselor, which you can do by calling your local treatment center for a referral.
Good luck in your recovery and remember you need never again feel such low-self-esteem.