I have suffered like you for the past 24 yrs. recently I found a cure for it. It has something to do with nerves. To begin with just measure both you hands(palm side) from the tip of your middle finger to the first line on your wrist. You will notice that there is a little difference between the length of the two hands.
Pull your little fingers one at a time on both hands or have someone else do it for you. Now breathe. You will be able to breathe easily. Do let me know if it is effexctive and I'll tell you what you should do next.
love and luck