Thanks for posting your query
As your child has already gone through various investigations and all are normal it seems that his symptoms are functional. Abdominal discomfort in the morning before school time is very common in this age group. What you need to do is to be sure that there is not any underlying disease and avoid spicy, fried, carbonated,junk foods. You can also avoid dairy product for few days it will help if there is any lactose intolerance
. Support your child mentally and emotionally. These functional pain usually subsides in few months. If it is severe you may give some antispasmodic, laxative if any constipation
for acidity. As far as cough
is concerned 6 to 8 episodes of cough and cold in a year is normal in a child if it is not requiring any admission in hospital.
I hope this answers your query effectively.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
Please accept my answer in case you do not have further queries.
Wishing you good health.