constant stomach pain

hazelhickory

anyone else's child complain about their stomach hurting constantly?  DS complains almost daily that his stomach hurts but it doesn't seem to effect his energy levels.  Sometimes he will sit down and say it hurts but after a few seconds will go back to whatever he was doing.  We have been to the pedi three times and they think it's a constipation issue (but even after going to the bathroom which he does daily he still says it hurts).  DS has been put on miralax, but his doctor thinks it will take 6 months before it clears which seems like a really long time to be on miralax to me.  any others face this issue or have suggestions?