For about the past three months I've had this problem and I don't know what it is. I'm not able to take a deep breath I can take short breathes but then when I try to take a deep breath I can't sometimes this will last for an hour sometimes 5 or 6 hours. When this does happen it's usually when I'm just sitting around or if I go outside and it's hot then it will kick in and I can't take a deep breathe. I have been to the doctors and they said it's not asthma, they don't know they assume it to be anxiety, but I'm not in an anxious environment when this happens, i far from anxious. Does anyone have any ideas? Thx