I think that you have made your own diagnosis with your son. As he attends a creche there will always be one or other of the children there who has a cough or cold. The infections readily spread from one child to another especially with those infections caused by the RS virus. Your son will usually start off with a cold and then his chest becomes infected. When he has a cold he will usually have a problem with a post nasal drip causing lots of mucous to run down the back of his nose,be swallowed and landing up in his stomach. This will cause him to vomit at times. You need to boost his immunity with Creche Guard or Scotts Emulsion plus a probiotic in addition such as Probiflora Children's once daily.Keep his nose clear by using Salex nose drops twice daily every day.For now also continue with the Bisolvon and using the nebuliser as you are doing.
He seems to be getting by himself now so it does not appear to be necessary to take him to the doctor.
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