Dear rosalin, paraoesophageal hernia
is a chronic disorder which will not be cured spontaneusly. It can be very serious if stomach gets incarcerated and chances for it are higher if hernia is bigger. So this kind and size of hernia wont be cured by lifestyle changes or medications unfortunately, you can only make your symptoms easier. So the best thing to do is a surgery procedure which is called Nissen fundoplication
where stomach is fixated around oesophagus, it is simple and routine procedure so you should consult your doctor about it.
Wish you good health, dr. med. Ivan Romich (Rominho)