Hey guys! Long time no see... STORY TIME PART 1

So, after nearly 3 years of it, I put in my advanced notice...I quit working at . I was beyond miserable for the most part of last year, and after this past Sunday's events...I was just sick of it. I was done. So, to explain....It's story time. Now those of you who have worked fast food before will most likely be un-surprised, but customers can be assholes... and anyone who's sat and listened to me rant about work before also knows that coworkers can be unreliable. This time it's a combination of the two, though the blame is more with a customer and my dwindling patience than my coworker. Sunday, I was scheduled to work 4-9, a nice easy shift compared to my normal closing hours, and I was pumped for it, I'd get out early, wouldn't have to sweep and mop or clean things up, yay me, right? Well it all started when I woke up that morning. Lately my lower backs been hurting...a lot, it's just some muscle pain, proof I need to relax more, but when I woke up, it was killing me...any breathing deeper than normal, ie a cough, yawn, etc...hurt...a lot! So I picked up my phone, intending to call the manager and let her know I wouldn't be able to do any heavy lifting and would prefer not to work, only to find I already had a text from her that basically said, "Hey girl, (insert name here) can't close tonight because her husband had a seizure, I scheduled (insert trainee name here) to come work your shift with (insert brand new trainee here). Thanks, appreciated." no real 'can you do it?' it was more of an implied 'you're the only one who can right now' so I texted her back my condition and asked if the other guy on my level could cover it, and she told me he was already covering someone's shift...so I begrudgingly agreed and figured at least Tuesday was a day off...I could close Sunday and Monday...even if my back hurt. When I got there, it had been really busy, so there were lots of dishes and lots of food prep, trashes were full, etc...you know, picture your messiest day at work. I did my cash in and decided to address the trainees...both of whom are a good 5 years or so older than me...and I'm no good with giving orders. I told the one who's able to run the cash register to work with me on food and actual customer service and told the new girl to do dishes and take out trash. Of course, rush comes New guy and I are out there serving LOTS of people...I run back because we are out of prepped up mayo and New Girl asks "since all I'm doing is dishes can I run out for a smoke?". I'm looking at her like 'DO YOU NOT EVEN HEAR THE DOOR DINGING?' I say "No. We're kinda busy right now! Do dishes!" The afternoon proceeded on like this for a while, and both trainees left at their scheduled 7....It slows down and I start getting to my evening cleaning...when I have another short rush, handle it like a pro, and my bff comes by for some cookies like usual...we talk for a sec, and my sister and brother stop by with food...Sis made it herself and tells me she hopes I like it, customer comes in and I start to serve her, sis and bro leave in the middle, friend stays. Customer orders her sandwich and leaves for bathroom while I make it, no biggie, she returns says women's room is out of soap...I figure I'll handle it when I'm done serving her, but as I ring her out another lady comes in with her toddler. Lady orders her sandwich, asks for it toasted and heads to bathroom...comes back out a while later and says to me "that bathroom is fucking disgusting! there's pee and toilet paper all over the floor and it smells like shit" I say ok...I"ll clean it up as soon as I'm done serving you. Finish serving her and head to the bathroom, telling bff on the way there to just take my food home with him because I really don't have time anymore with all the cleaning I have to do...and walk into bathroom....it was FLOODED and gross...I sorta look at bff who followed me in to see the mess and go WTF??!?! Then after cleaning it all up...I sit down and just sorta decompress...attempt to eat the food bff still hasn't taken home, and the business phone rings...It's Manager...she tells me Owner's daughter got a call from a customer saying I swore at her and was really rude because she asked me to clean the bathroom...I'm pissed. I was more than polite with her....and I say so to Manager... Manager says ok and I get back to work...(MORE IN PART 2 didn't know there was a character limit)