Symptoms of wheezing and breathlessness suggest that you could have asthma and it would be best for you to have this confirmed or eliminated.
Asthma can lead to coughing on exertion as well as during the night. It can also be made worse by stress. I would suggest that you make an appointment with your doctor.
Do you have questions? Please feel free to ask.
Stay up to date with the latest pollen information by finding your local pollen forecast from over 30,000 locations across the UK.