Welcome to HCM
Your history is seasonal allergy
and breathlessness and stuffy nose, there is strong possibility of allergic rhinitis
and Bronchial Asthma
Do not panic and worry as this is not a serious problem and it can be treated sometime may not be permanently but symptoms can always be controlled with proper medications.
You are taking anti allergic and anti- inflammatory(Predmet) which should give you good relief in few days time ,but take these medicines under medical supervision only.If breathlessness is more inhalation /nebulization therapy will be helpful.
If a detail work is required by Complete Blood count
,serum IgE level,Pulmonary Function test and if required allergy tests
and ENT consultation may be required.