I am sorry if this is not in the correct section but i think this might be the right one. I am having an issue sometimes with a feeling I get every once in a while. What usually happens is I feel a tightness in my chest, I don't know if this is actual tightness or just anxiety. It feels as if my ribcage is to small or is pushing in on me. I then begin to stress about this feeling and I get lightheaded. I have never actually passed out. While I have somewhat gotten used to the feeling of my chest the lightheadedness is not as bad. but this feeling in my chest is worrisom to me. Does anyone have any idea what this may be? By the way I am 25.