It's just a natural consequence of malnutrition for so many years, and the transition from your body moving from alcohol as a primary fuel to actual food.
Eat lots of good fats. Stay away from excessive carbs and sweets and caffeine. Get into a moderate exercise routine. Learn to cherish green tea. Sleep. For the first time in a long time. Sleep. I'm serious.
Let a few months slip by without relentless need washing over you all the time and just settle the fuck in and ride.