Thanks for asking the query,
According to your symptoms difficulty in breathing can be due to asthama, heart defects, structural abnormalities, pneumonia
I would suggest you to visit to the Physician a get complete physical evaluation done.
Also consult an ENT specialist
to check if there are any sinus infection
Also maintain a good oral hygiene
by taking lukewarm saline ad antiseptic mouthwash rinses.
Hope this helps out,