I haven't had a panic attack in months. *knock on wood* But, the last few weeks, I have been having a "suffocation" feeling and "heavy chest" where it makes me feel like I cant breathe right. I notice myself trying to take a deep breath every once and awhile just to feel comfortable. This goes on all day and all night, and I am awake every hour of the night it seems like after I fall asleep. I would appreciate any advice or anything on what I could do. I've tried taking my xanax at bedtime (i have the lowest dose of .25) and I wake up within a few hours. Not sure if it's because it wears off or what. Thank you .