Hi i am a 49 year old male with mild angina, i am on medication, bisoprolol, atorvastatin, and aspirin, i have been taken these daily for seven years. I have noticed a shortness of breath, and on exertion breathing feels restricted for twenty minutes or so then im fine again, xray of lungs were fine, they think i m showing signs of asthma, but i have never had asthma before, can blow 600 or more on the peak flow scale. can the problem be my medication. many thanks