Hello, I dont know how to explain this exactly but lately I always feel like Im not inhaling enough air and every 5-10 seconds I take a very deep breath till I can feel it in my chest so the suffocating feeling goes away for a while but its becoming everyday more of a problem, I belive this is caused because lately I started keeping my abdominal muscles flexed/ tummy sucked in and this interfered with my breathing but I dont really know...Id really like your advice on this, thanks for taking the time to read my problem!