
Headache, Cough, Stomach Pain, Diarrhea, Sleeplessness. Taken Robatussin

Thanks for posting your query.
You should consult with physician / pulmonologist.
You should go for chest x XXXXXXX pulmonary function test (spirometry), complete blood count, serum electrolytes, renal function test.
Recurrent cough may cause headache.
You may have acute viral gastroenteritis with acute bronchitis(caused by the same virus).
Some times patient has severe cough and on examination chest is clear with no ronchi. Such condition is called as "Cough variant asthma".
Inhalational therapy including anticholinergics and beta 2 agonist have beneficial effect in such condition.
As your condition is not improving with cough suppressant , possibility of cough variant asthma should be searched out.
Put your query if you have.
Best regards,
Dr. Mayank Bhargava

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