TL:DR, my back hurts and instead of calling in sick a few hours before work, I call my boss to tell him to find someone else to come in and I still feel bad. help and encouragement highly appreciated

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I work 3-4 days 12 hours night shift, it's not glamorous but the pay is decent, but the past 2 days have been absolute garbage, this night was the worse, I pulled my back, took some pain killer and finished the day (I just couldn't leave 2 students to finish the work). tonight I'm working with another operator (not students) so it's not like I'm leaving my department without an operator. but I still feel bad, like I don't deserve that day off, that I should just 'suck up the pain' and go to work. I try to convince myself that it's just a terrible way of life we've been taught, that if we're not helping a company make it's millions of dollar we're garbage, and that we should sacrifice our health, our wellbeing, for a company that would replace you in half a second, but it's hard to push that into my mind, and my anxiety spikes up.

 I feel like they'd fire me because of that, I feel like they won't approve my next vacation (god knows when that'll be), I feel like I'm just not good enough, I feel overwhelmed and tired and just done, I feel like I'm just stuck and I hate it, rn I can't even fall asleep becausemy back still hurts and my anxiety is stressing me out, I even close my smartphone to avoid my boss calling me, again because my anxiety is spiking and I just want the world to freeze in time and just have a few days to just breathe, to just not always run from one place to another to not always feel stressed and anxious and I'm like in a bad place mentally right now and I need help, I need a bit of confirmation, to get people to ...idk...tell me that taking care of my health is as important as work, because I want to believe myself but I just can't 

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thank you for anything you say, thank you for just letting me post my worries, writing it down helps but I still have a hard time with it,