Hi... Welcome to healthcare magic. According to your complain you have problem of stomach pain that may be of because of excessive coughing strain a muscle. Strain muscle relief occurs within a week. You are mentioned there is constipation problems also occurs .Constipation cause tighting of abdominal area. Take a bulk forming agent like psyllium. Drink a more water per day.. Take kiwi and peach helpful in digestion. Take high fiber foods like whole grains, oats...etc. Avoid gaseous foods like cabbage, cauliflower and carbonated drinks etc.. Consult a gastroenterologist for further treatment. I hope my guidance helpful to you.. Take care. Thank you.