I’m so exhausted

I’m literally just a csa but my GOD can we get alittle help??? You want me to do run front, run photo, take passport photos, do fed ex, deal with annoying ass customers, and then finish front store truck? Like I can finish truck and do all these things but it literally takes such a toll on my mind. I get so irritated and then I’m being told I’m not doing enough!?? HELLO I HAD TO DO 10 CANVASES AND RUN FRONT. Also I my manager when he has a bad day god he has a bad day. He takes it out on everyone, is passive aggressive, talks very violently. It’s so unfair. I literally cry in the bathroom bc I feel like I just can’t get enough done and with my boss basically throwing a tantrum bc my coworkers don’t work as fast as he do. My coworkers show up late, and or don’t show up at all. I’m tired of my managers hiding in the office having conversations and being on their phones while I’m literally struggling at the front. Then I feel like a burden when I need help. I also HATE HAVING TO ASK TO GO TO THE BATHROOM I FEEL LIKE A CHILD!!!! Why are Walgreens expections so high? I was the operations manager at cvs for many years and it was NOTHING compared to this shit. I miss cvs I made more money, had more hours and I never did as much work as on operations manager then I have as a CASHIER at Walgreens. Now they want me to be a shift? HELL NOOOOO