I was fighting with stress in a previous job where I just felt like drowning each day, never seeing an end to the torment and it was devastating. I had to entirely quite my line of job and shift career to get out of it and claw my way back to a good life without stress. I can recognize a lot of my past in what you write, specially the part where you mention not to stress about things out of your control, that what's really helped me to even start working on my own problems :)