If you're drinking a lot every single day, and especially if you drink all day, it's very common to lose some or all of your appetite. Something I read, which I can't seem to find now, said that when your liver metabolizes alcohol, energy is produced in large amounts, so your brain slows down or shuts off your hunger for food. I went three days at a time without eating on more than one occasion as I hit rock bottom. Once your body detoxes (typically 48 to 72 hours), your appetite will come back (and if you're like me, it'll come back with a vengeance).
Have you looked into getting medical help detoxing?