Thanks for your question on Healthcare Magic.
I can understand your concern.
Yes, this can be due to allergic disease like asthma or allergic
bronchitis because you are improving with zyrtec (cetrizine). Cetrizine is antihistamine and used widely for allergy.
In my opinion, you should
consult pulmonologist and get done clinical examination of respiratory system and PFT (pulmonary function test).
PFT is must for the diagnosis of asthma and allergic bronchitis.
It will also tell you about severity of the disease and treatment is based on severity only.
Combination of anti histamine and anti allergic (
montelukast) is more beneficial than antihistamine alone.
Inhaled
bronchodilator and inhaled
corticosteroids (ICS) are the mainstay of treatment fr breathlessness.
Don't worry, you will be alright. No need to worry for low circulation.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.