I had a tough day at work, feeling my bosses don't appreciate me and are mad at me. My direct boss mostly tells me there's no need to take his angers personally. My retail manager can say humiliating sentences such as "Just check X and tell him Y, you're a grown 'lad' you can take care of that". That pissed me off inside and didn't know how to confront this, other than throwing a "Of course I can do this".
I come home to my comfort zone - my room, and my belly is squinted.
What does it mean? I work hard on identifying gut feelings, and it feels like my gut is ruined yet I'm not sure.

I'll further add whenever someone gets angry with me my fingers can mildly shiver with hurt feelings. Today I let their criticisms "improve" me and communicate in an assuring way.
For example, my direct boss assertively yet angrily insisted I clean the storage room "so the other co-worker (who came for an evening shift) can work more comfortably". It felt bad and it makes it difficult for me to concentrate on work, but I pulled myself and told him "Don't worry, I'll take care of everything so you have nothing to worry about", to which he replied "Not a worry at all, I know things get settled eventually", still with his angry tone.
By the end of my shift I asked him "Would you like to see if the storage room is ok?".
He came, he saw, said his "well done" and a tiny note about a cart.
I asked him if there's anything he needs me to sort out, even beyond the storage room, and he dismissed.

Anyway, I'm back home and my stomach is squinting.
What does it mean?
And how did I manage myself with the supervisors? Because with the squinting stomach feeling, I'm not sure I've managed well. They mostly made me feel dumb and unreliable.