Has any one given their toddler melatonin and had them vomit??

My son keeps throwing up at night. He had the stomach flu last week and ever since he throws up every night. The only thing I can think of is the melatonin because it’s the only thing he’s had that would possibly mess with him I guess.

He’s not allergic to anything and hasn’t changed his diet in any way. And the stomach flu thing was over last Monday. He’ll be good all day then at bed time he throws up after being asleep for like two hours he wakes up throwing up screaming.

Any ideas or advice??

I’m not sure it warrants taking him to the ped doctor.