Thank you for your question - and a great one it is!
My colleagues have given you excellent answers and I certainly wont repeat them, but the one thing I might add is it might be worth seeing a respiratory/sports physician who is experienced with runners.
You see, sometimes breathing difficulties can also be due to exercise-induced asthma. If you are having a runny nose and congestion, you will most likely have an element of atophy (asthma, eczema, allergic rhinitis). Sometimes, this can manifest in exercise-induced asthma too.
Seeing someone and being assessed for this might be helpful!
Good luck with your running and symptoms.
BW
Dr Dinesh
