Deep breathing problems. Appreciated.

M/27, from Kolkata- I am suffering from deep breathing at several times of the day. I have been having this issue for nearly a year or more. at times, i take really deep breaths and still feel the inhale to be incomplete, hence forcing me to inhale deeply from mouth. it occurs without any definite pattern- but when it occurs, it stays for an hour or two. then again happens after few hours. happens comparitively less when I am in AC room. i did swimming during last summer and that time the breathing problem was a lot less. i do not have any known diseases currently but my family history has asthma (my grandfather). i do not smoke at all, and drink very occasionally. i have a basic active lifestyle, no major emotional stress except normal stuff, working in software industry, and diet mainly on proteins & vegetables. any suggestions to help me would be greatly appreciated. thanks