Since when are you having these problems? What is your age and have you lost any weight?
If these problems have been persisting for sometime now, then it might be a gastric ulcer which may or may not be associated with a hiatal hernia
You should get yourself checked up by your physician and he might subject you to an upper GI endoscopy
(which will be helpful in picking up an hiatal hernia and a gastric ulcer). Both these problems have good treatment options available. Getting yourself checked up by a physician might even help in picking up something which is not completely evident.
Hope you get well soon.