I was diagnosed with costochondritis about three months ago due to sore ribs. I've noticed I have not been able to fill my lungs to full capacity in this time, experiencing shortness of breath whilst exercising or doing daily activities (whilst the costochondritis has subsided). Four days ago I started to have flu-like symptoms. This only lasted two days, then had a day where I felt better, but now today I feel so much worse, have so much phlegm in my chest (spitting out big light green with dark green specks, orange and yellow phlegm).

Should I consult a doctor?