Neuro/Tummy Side Effects of Prevacid??

Has anyone heard of any neurological or tummy ache side effects from Prevacid? We went to the Pedi GI last week and she said that some kids can get bad tummy aches from it. Then today at the Pedi he said that there could be some neurological side effects from the Prevacid. This is new to me, hadn’t heard it before, but now its making me feel concerned about it. I think Harrison needs a higher dose. He’s been taking 7.5 mg in the am and 15mg in the pm. His nights are GREAT and his days are ok, but could be better (like he won’t sleep unless he’s gone for a ride in the car & in his car seat, or if I actively rock him and then hold him), so the Pedi told us to reverse it and see what happened. SO tonight I gave him 7.5mg at night and will give him the 15 tomorrow morning. (But that means that today he’s only had 15 instead of 22.5 mg total). So far he’s been asleep for an hour but he’s much more phlegmy/congested sounding than he’s been, so it sounds like there’s more stuff there than usual. The pedi said if it his nights are still good and his days are then good on this dosage, to leave him at that, but if his nights are worse and days better, then we know he needs 15 2x/day. We had Dagney on 30mg starting at 4 months, and she was great on it, so it wouldnt surprise me that Harry would need it too, but now hearing hte docs say these side effects, i’m scared/concerned. (I had also shown the Marci-kids info to the Pedi GI with Dagney, and last week asked how/when research got accepted or more mainstreamed, and she said that she didnt think marci-kids did any real research, but was just giving high doses of the PPIs to infants.)