I'd take him to your GP and request allergy tests if I were you.
Also, in responce to your question about pasta sauces, you could do a veg sauce, I do this all the time, you can blend it all up so he doesnt know he's eating veg, and make it with sweet veg like carrot, butternut squash, etc to make it more platable if he doesnt like veg.
Hope you manage to get to the bottom of it x
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