Urge to take deep breath or sigh.

Hi there, I am little bit worried about my breathing pattern as i urge to take deep breathe or sigh in every 1 minute as at times i feel that i am not getting the satisfied air so i do it. It has become a habit now you can say.. When I take deep breathe then I got relaxed. I dont do it while sleeping if I am feeling sleep or I am buzy in some work then I forget about it but when I pay attention to it I started realising that i need to take a deep breathe now or I will suffocate.. and I also get out of breathe when i do some physical activity like climbing stairs.. I take 10 mins atleast to relax after that.. I also got an xray done to check whether there is any issue with my lungs or something like that but it was normal.. Doctor please tell is there anything for which i need to worry about my health or its because of anxiety?