Have a hiatus hernia (5cm)and ever since it became problematic i have had troubles getting a deep breath esp when cycling, sensation of not being able to breath out fully. Dont have acid problems very often now and my peak flow (bit of asthma so i keep an eye on it) is around the 600 mark (when resting) which is good for me. Anyone with similar? Is it the position of sitting on the bike which somehow makes it worse - pushing the hernia up??