You might have been malnourished. I am not your doctor but a nutrition specialist I was put in front of WhenI went to rehab told me that at my age I needed at least 50 grams of protein a day, any kind of beans, lean fish, chicken or even stake. Plus some veggies. Lots of veggies. Potatoes but roasted. This may not work for you so you need to find a plan that does. Many alcoholics suffer from malnutrition.