Hi Lola, you are not alone in this matter! thru out the holidays, my son had a runny nose and cough.i tried everything i could over the counter, luckily, my bro-in-law who is a GP in the UK recommended Zirtek. its actually an allergy medication. he is convinced that most children have higher forms of allergy during the summer, also especially if the lungs are clear.
However, i am not sure if you can buy it over the counter, as it may be a prescription medication.
so pls speak with a pead and get their opinion.
hope this helps.