Bad Gag Reflex

More than likely, and if his sinuses are draining down the back of his throat, like post nasal drip, he could be accumulating phlegm in his tummy and it is making him queesy. Try n all natural saline spray or nasal drops to clean his pour little nostrils out, maybe give him a little relief.
I know that everyone first reaction to a cough is cough medicine, but cough suppresants can actually do more harm then good in most cases... look for something more like an expectorant to help him bring up the stuff that is running down his throat.

Keep an eye out for aspiration and fever, if he seems like he has inhaled some of the stuff and starts a fever, you might want to call the doc so he can rule out aspiration pnuemonia.

I am sure it is just the little bug that is going around and he will be back to his normal self in no time! Best wishes for a speedy recovery for the little man!

I gag on fabric and on tags. It is normal. Some people have more of a gag reflex than others. I almost vomited once on my dentist when he tried doing x-rays of my teeth. He advised me not to eat prior to a cleaning so that the food won't actually come up if I ever gag again, but he told me gagging is perfectly normal and I wasn't the first, nor last, patient who had a strong gag reflex. It's actually a good thing as it prevents foreign objects from entering and lodging in your throat if you gag on them. As long as he isn't gagging on food, there is nothing to worry about.

As to the vomiting, kids do not know how to expectorate phlegm, and will vomit in the process. Every time my daughter is congested, she will vomit a sticky vomit to try and get rid of the phlegm. This is also normal. I am sure that once his infection and drainage are gone, he won't have problems with the vomiting anymore.

Check the side effects of any drugs he was on. Find a chiro that does nutrition, and get some help for his immune system.
Lots of water, no sugar.
best, k

His tonsils may be enlarged .That with post nasal drip could cause gagging.

Whenever my daughter gets ill (she's almost 15 now) it always manifests itself in the form of vomit. We called her the vomit comet when she was little. If it was an ear infection, a cold, the flu.........always transmitted to vomit.

She would vomit, want to eat, and be fine. Sometimes she'd eat, vomit, be fine and want to eat again.

I've had doctors galore look at her. Nothing. I don't worry too much about it unless it's persistent. If so, we usually get meds from the doctor to help with it.

I bet once the drainage goes away, so too, will the vomit. It could be just this phase of illness.