What should I do about shortness of breath if my inhaler won't work

I have been having shortness of breath,chest pain and tightness,and heart palpitations for 3 months.I was diagnosed with mild asthma in 2006.I took an EKG,Blood work,Stress Test,all of which came back normal.But my symptoms are still the same.You know how after you're working out,you feel out of breath,and then you catch your breath,and gradually your breathing goes back to how it was feeling before you started working out?I feel like I am somewhere in between when you start to catch your breath,and when you start to feel the way you were feeling before you began working out.Thats the way I feel all the time.And it doesn't take much exertion for me to feel short of breath again,and also for it to feel like my heart is beating faster than normal.I took a pro air inhaler three times,and it hasn't helped.Should I take an angiogram?Does anybody know what could be wrong with me?

You were dx in 2006 and I assume you are seeing a Dr. as you have a RX inhaler. ProAir (albuterol sulfate) Inhalation Aerosol is indicated  for the treatment or prevention of bronchospasm with reversible obstructive airway disease and for the prevention of exercise-induced bronchospasm. If you are out of your inhaler and you continue to be SOB with exertion you should contact your Dr. for further instruction.

If you feel you are in a medical crisis present to the closest ER or call 911.

Wishing you the best and hope you seek the help you need.

Kindly,

Kitt