it looks like you have asthma
which is mild now. asthma could be due to many reasons. you have dust allergy
or seasonal allergy
. you need to do complete work up your lungs. get a lung function test done to confirm asthma. then also you may have to do allergy test to know if your allergic to something.if you have allergy then you can start immunotherapy
before your asthma symptom increases. go to both pulmonologist for asthma and immunologist for allergy testing.
your symptoms of asthma has just started it can controlled very easily at this stage.
also improve your general health ,as it may be because of that your symptoms have come back.