Can I sue my district manager?

Hi so I was working today and it was a really busy day and there my coworker and I working. It was really busy and I haven’t taken my lunch and If I have taken my lunch my co worker would have trouble working my myself so I decide to close half the gate to take my lunch. I was working on my lunch at the same time and never even got to take a break. I also was having a hard time breathing and I have to use an in haler once in awhile when my chest hurts. My district manager got upset and said I couldn’t close and wasn’t worried about my health she ignored my statement and continued to say I couldn’t close the store but If I didn’t something worse could have happened.