Jobs have a way of exploiting you, so there are rarely any bad ways to quit. But I've recently have had to manage a lot of anxiety and shame because I quit my job with one days notice. I've started cycling again (i have bipolar 3) and I needed time off urgently. Not only that but they weren't giving the legal amount of required breaks and the work is just too physically demanding. I'm a musician who needs to focus on music and staying sane. But i can't shake the guilt off. Even though I'm a literal Marxist :'). I gave in a resignation letter detailing why I'm quitting and even apologizing that I did it this way. Someone told me if I were to get fired by them, i wouldn't get two weeks notice, so why should I feel guilty for not following the proper etiquette (which is kinda bullshit anyway, isn't it much worse for the employee getting fired to not get two weeks notice? Since it could be their whole livelihood?). 

Anyways, i need to go in for my last shift today and I'm extremely anxious. Any advice or other similar experiences would be deeply appreciated. I used to know ppl who just wouldn't show up to work one day and not think twice about it. I need to be more like that sometimes.