I understand how hard it is to quit drinking as I am 13 days sober. I would suggest you go to your Doctor and talk with him about your wish to quit drinking. Doctors are usually very understanding and can give you advice and possibly short term medication to make the withdrawls easier.
After that, you really need to stay on this Board and realize you are not alone. You might want to consider going to an AA meeting or another social organization that you can relate to. Getting rid of the depressive thoughts is important in early recovery.
I wish you well and hope you give it your all not only for yourself, but your girlfriend, family and physical health. Hang in there.