Uneasy feeling. Anxiety or due to gas.

Last week in the middle of the night I woke up with a feeling of nausea and then I suddenly started feeling uneasy, as if I had anxiety but no chest pain or anything, and then after a bowel movement, I took PAN D and then was feeling fine. Since then, again another day, I had the feeling as well as today, when I went to a restaurant, after a bit of a heavy meal, I was feeling the same. And then I felt gassy and wanted to have a bowel movement. I have consulted with a doctor of Internal Medicine. I did all the blood tests, lipid profile, thyroid, sugar(fasting and pp) as well as an ECG. All came normal. However, the doc measured my BP to be 140/80. My weight is 99kilos(I have cut down on calories). I had a smoking habit which I have quit now. Kindly suggest if I need to do any other test or is it just anxiety or due to gas.