How long does excess phlegmyness last after flu ?

[Sothisishowitfeels]

I had flu which ended probably 4 weeks ago/ the last week though I have had loads of phlegmyness and popping and wheezing but in the top of my chest/ throat not deep in my chest I don't think?. I am coughing up phlegm but it's not yellow or disgusting .

I have quite a tight chest on occasion and for some reason my back and shoulder are really stiff when I breathe.

My cough was gone at the end of the flu! But now it's back! Is this the end of flu or is it a whole brand new lovely cough??