Has anyone had this? Does anyone know how to relieve it?

So I keep getting these weird twitches in my stomach. Been happening for like two months now. It's worst after I eat.

It low key feels like somethings inside me lightly tapping on me, while other times it seizes like when your muscle in your leg or something spasms randomly. I can't feel them when I lay my hand on my stomach. It feels like it's deep in my intestines.

I suffer from bad constipation and stress related stomach issues, and have been for years. But I've never experienced this before?

(I had a vaginal ultrasound at least 3 months after I last had sex so I'm positive it's not a fetus)