Not Sure if Its Anxiety, Acid or Lungs

Please help

I feel like i cannot breath and that my chest is tight. I cough a bit but nothing crazy . Im scared my lungs are going to collapse or im going to have an ashma attack. I do have mild ashma due to seasonal Allergies and have an emergency puffer that i use when im wheezing. i dont feel Wheezy. How do i know its not My lungs going to Collapse? I was fine this morning. Im at work and soo scared hope someone can help me???

Have you ever felt like this before, Bambola, or is this something brand new for you?