My life is falling apart.

I think I might have copd or lung cancer. I quit my job working with kids because I kept getting sick. The last sickness did me in and aggravated my lungs permanently. I'm trying to quit smoking. I used to have a career in hotels. I could be (and have been) a front desk manager/gen mgr. But I end up quitting every job because of either stress or people causing me issues. I moved back in my parents a few months ago. I don't feel like I can work anywhere now because I'm constantly coughing violently. I don't want to annoy or worry my parents. So if I feel a major cough coming on, I'll just go take a drive. I don't have any money saved up. I just know even if I do find a job, something will happen like it always does and I'll quit. I'm 46 years old. Still far from retirement. I've been working since i was 17. I'm so burned out on working. I just want to give up on life. I feel helpless and useless