My two boys have both had tummy issues after eating something they weren't supposed to - Kalani ate some of a plastic mat and Pi'i ate some duck poop

After numerous tests, xrays, etc., to eliminate the possibility of a blockage or infection they were both put on antibiotics and anti-nausea meds till things calmed down. For weeks afterwards their tummies would do what your little one's is doing and my vet recommended Pepcid. Maybe ask your vet about it?
Oh, and welcome to YT