I Have Been Diagnosed With Copd Back In June Of

I have been diagnosed with Copd back in June of this year. I went to the ER thinking I was having a heart attack.Not the case.Copd well he gave me a breathing treatment,predisone, and told to follow up with a doc. Well I did. Now he tells me he can't do nothing for me I feel like I am suffocating my chest feels pressure all the time. My left side of my rib cage hurts all the way to my shoulder. So in the meantime I can only go to ER for help.Should I just wait it out and continue to get no treatment?
My back looks slightly bruised around my ribs