I quit 28 days ago

So I decided to quit because I was in work and had to sit down absolutely gasping for air. So since then I have been cold turkey. I have noticed I can breathe better, my taste buds have changed and I am starting to like more food. And also my sense of smell has some how got much better but my question is has anyone suffered with a tight chest and a bit of pain? But also coughing up phlegm but in a jelly substance? (A lot thicker than normal)