I am 45, female, weight is 110 lbs, height is 50.  Recently I have difficulty breathing when I walk...my arms hurt and my chest hurts.  I have already been to the cardiologist and all tests were done and everything is fine.  If I take Zyrtec I feel a little better...could it be allergies?  or something wrong with my circulation?  Thank you for any advice you can offer...
Thanks for your question on Chat Doctor. I can understand your concern. Yes, this can be due to allergic disease like asthma or allergic bronchitis because you are improving with Zyrtec (cetirizine). Cetirizine 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 for breathlessness. Don't worry, you will be alright. No need to worry about low circulation. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.