My breathing is labored with activity. heart and lungs fine. 2 miles today and upon 24 minutes stomach tight, like too full or holding it in. advise?

Exercise-induced ...: You may be suffering from exercise-induced anaphylaxis which in some cases only occurs after one has eaten up to 4 hrs prior to the exercise. Others only after having eaten a food allergen which would not have caused problem without the exercise. On the other hand, you may have just exercise-induced bronchospasm . Need to consult an allergist to sort it out.