5yr old complaining of abdominal pain for ten days?

Hi mamas, I’m feeling really overwhelmed and hoping someone has been through something similar.My 5-year-old has been having mild abdominal pain around her belly button for the past 10 days. She says it hurts more when she eats, and she brings it up almost every hour. We’ve been to the ER twice when she was acting really off, had an ultrasound (though they couldn’t visualize the appendix), and saw her pediatrician. We’ve tried cutting out dairy, using Miralax, and doing all her favorite things to lift her spirits—nothing is really helping.

She’s still playing here and there like herself, but she’s been really clingy and keeps telling me she feels “sad for no reason.” I don’t know if the tummy aches are causing the sadness or if it’s the other way around. We’re just stuck in this cycle of discomfort and needing constant comfort. Nothing has changed either that could have triggered this. It's so not like her.

I’m emotionally exhausted and starting to second-guess myself. I just want to help her feel better. Has anyone gone through something like this? Any advice or insight would mean so much. 💛