Empty stomach feeling

I Have IBS and Hiatal hernia.
So most of the times my stomach and abdomen I used to feel bloated and filled.
But It's all changed couple of months of before.
Now just after I finished eating, my stomach and abdomen feels completly empty.
Its like I have never had a single piece of food in my gut.
Also I can feel my stomach moving fast and all shrinking inside.
My abdomen shrinks inside in such a way that I have to tighten my wiast belt to keep my pant.
Especially I don't have dumping syndrome, just very void empty feeling.
Sometime I even hear the sound of my gut motility.
Is this part of IBS?
I tired eating 3 meals in half hour break, but everytime after I finished eating,
in less than 2 mins everthing I have eaten seems gone inside my gut.
This empty and shrinking stomach feeling is giving me anxiety, also at those time I feel
my cloths are loosened up.
Anyone experience this symptom?

Well, your intestines are hollow, this the sound. I`m not entirely sure if your hearing your stomach (since multiple people often mistake the stomach doing so when it's the intestine) Is it around your belly button or further down?

Are you going more frequently, by chance? I used to get that feeling all the time because everything wouldn't actually settle. (IBD) Maybe your not digesting it slow?

Though, either way, check with your doc. It could be that your speeding up when your supposed to be slower.