Bad Cough /chest.

Had a really bad dry cough for 4 weeks now into it's 5th week it's now likea chesty cough coughing up green phlegm went 2 doc had swollen glands and fever took antibiotics augmenton duo he listened 2 my chest and and said it was clear felt a bit better but dry cough was worse went bac 2 doc said my chest was clear again I went 2 another doc cause I felt rotten shivery and weak I also have shortness of breath on excertion new doc said he heard crackles in my left lung so he gave me a stronger antibotic I have had shortness of breath and my chest is soar from all the coughing, I had Pheumonia before do you think it might be that just a bad chest infection, maby im so worn out with it cant sleep at night cause im coughing all night can you help please The 1st time I sawthe nurse and she took my peak flow which was very very low I dont have Asthma as far as I know 2nd time I saw nurse she asked about a chest x ray I told her I didnt have one the doc didn't suggest it she replied interesting, Im nt sure if my chest feels tight or if it's just soar from all the coughing can you please help thanks, by the way im 24 female