Help! My 15 month old is constipated :(

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I have recently resorted to peg 3350 for my constipated 15 month old son, however I stopped giving it to him after he was on it for 5 days. I gave it to him out of desperation, as I can no longer stand seeing him suffer ... he now holds his poop because he is afraid of pooping. He cries, sweats and will kinda bounce himself up and down when he poops ... he will even let out screams as he is pooping, it's terrible. I had read online that the body only absorbs trace amounts of the polyethylene glycol but I am having second thoughts about it's safety. Even if absorbed in trace amounts, how can that be good?In order for my son to overcome this, his poop must become soft again so that pooping is painless. Only then I believe he will stop withholding. My son is breastfed and refuses bottles therefore giving water on a daily basis is a struggle. He does take the sippy cup and some days he does better then others. He eats plenty of fruits and veggies, therefore I don't think diet is an issue. He hardly eats/drinks dairy products either.If any moms have experienced this with their child, any advice to help my son is greatly appreciated!Thanks