Hi - I'm so sorry you're having such a time, but I do understand, believe me. I'm a recovering alcoholic/addict and I ruined more than 1 holiday.
I doubt you'll like my suggestion, but it worked for me and countless others. Tell your doctor -- he/she won't turn you in. Your doc will be able to help you taper off with the least amount of discomfort, plus be able to treat you in the future with meds that won't put you at risk for a relapse. You don't say how much you take in a days time but I'm sure it's more than the "norm."
Your doctor can be your best friend right now. He may also be able to suggest a detox facility, if you prefer. Do NOT be ashamed of this -- it happens more often than we think. Addiction is a disease - a FATAL disease. It's progressive but we CAN arrest it!!!! Don't put off getting help --- you can damage organs.
Also, please call NA -- again, don't be ashamed. Don't think that all you'll see is heroin junkies from the streets. We are all alike, and the people at NA know exactly what you're going thru. Let them help.
I wish you the very best. You have the POWER to do this. Don't give that power away to addiction. Peace, Lee