this has been going on for about 2 1/2yrs. it usually lasts the day and I have shortness of breathe and pressure on my chest, sharp pains with movement and takes my breathe away. the first time it happened it didnt happen again for 9months then it happened a few months after that and again a few months later, now its been 4 months without symptoms but I sometimes get sharp shooting pains in my chest and I feel like i have a hard time breathing sometimes. I want to know what causes this. Thanks




