PLEASE help me!!!

I’ll start off my saying I am not pregnant right now! Also unsure where this post belongs so I’m sorry in advance!

So I’ve had stomach issues for a few years that are going undiagnosed! Many hospital stays and testing have been done. But here is my issue...

I never can sleep at night with my stomach always grumbling or being in pain. I’ve tried pepto but then I get constipated & if I try miralax after that I’m diarrhea. So that’s a no no. I need to be awake for a flight in 45 minutes! What can I do to help this stomach grumbling & discomfort? It keeps me up 24/7.