6 years old vomitting, stomach upset...

For the past 3 weeks, my son has been having digestive issues.
They come on and off. First he threw up at night and in the morning (3 weeks ago) and then had diarhhea for 1 day. I gave him some naturapathic things (CS, Olive leaf, Probiotics), and he got better.
A week ago, he had diarhhea again for a day... felt weak, but then got better (again I gave him some natural things).

Last night he threw up twice during the night, his lower abdomen was hurting. I gave him some electrolites and probiotic and CS, he is feeling better again, but still not 100%

Could this be parasite related or viral? Please advise.
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