Brief Answer:
Hi and welcome to XXXXXXX
Detailed Answer:
Thanks for the query.
Such breathing difficulties may be related to heart and lung diseases,but if you dont have other symptoms such as
chest pain, cough,
hypertension, legs swelling and some other, I dont think this would be it.
I think that more probably this is caused by stomach disorder: ulcer,GERD,hiatal hernia or
gastritis. These conditions are very common cause of
shortness of breath especially after eating and in the morning since there is increased acid secretion which goes into
esophagus,mouth and larynx. Then it irritates
respiratory tract and people feel it as an inability to take enough breath. Breathing difficulties are usually aggravated by laying,eating food that makes you bloated and food that irritates stomach mucosa( coffee,alcohol, spicy food),sitting after meal, smoking, emotional stress and certain exercises.
If there is associated hiatal hernia then shortness of breath may be constant and this is typical sign of hiatal hernia.
So if you dont have known heart or lung disease and symptoms, you should focus on your stomach and esophagus. You should continue with antiacid therapy and change your dietary habits, eat smaller meals but more frequently,avoid alcohol and smoking, lose weight if
overweight, avoid sleeping and sitting after meal and sleep with elevated upper body.
If you want to confirm my diagnosis you should do gastroscopy and barium swallow test. It will reveal hiatal hernia or gastritis. There are some other antiacid medicines beside nexium which can be used so consult your doctor about it.
Wish you good health. Feel free to ask. Regards