Hello @darweshalassi

As your GI doctor diagnosed your problem as dyspepsia, I did some research on Mayo's website and found a link that describes the symptoms of nausea, etc. Here is the link, that you can read, https://www.mayoclinic.org/diseases-conditions/indigestion/symptoms-causes/syc-20352211

Given the fact that your doctor mentioned you have a large Hiatal hernia, did he/she suggest any diet recommendations such as small, frequent meals, low in acid, fat, etc.? Often diet changes can make a big difference in symptoms. As @astaingegerdm suggested, raising the head of your bed at night is also very helpful.

Have you made any of these lifestyle changes yet?