Buffalo Chicken without sausage

1 lb elbow macaroni , uncooked (preferrably the large variety) 24 ounces chicken breasts , cooked and shredded 2 1/2 cups low-fat milk 1/4 cup flour 3 cups[...]

4 cooked chicken breasts 3 celery ribs , diced 1 large onion , diced 2 carrots , diced 2 tablespoons olive oil 4 garlic cloves , minced 4 tablespoons butter 4[...]