I went from stage 1 COPD with coughing as my only symptom. Quit smoking Oct 31 2017. Jan 10 had major exacerbation and ended up with a-fib. It is April and I’m still having trouble breathing, heart settled out on meds and blood thinner. I had to retire I can’t work more than 10 minutes. I’m upset as I thought COPD came on gradually. It hit me hard fast. Is this how it was for all of you?