The symptoms you have described do look like a hiatal hernia
You need a thorough physical exam to find out the exact nature of your problem and to decide the treatment plan.
For now you need to eat light meals and do not sleep immediately after you eat. even while lying down you need to tilt the bed a little to prop up your upper part of the body.
You may need to take the nexium
again like before if the burning is moderate to severe.
In some cases it may even require a surgery. So I would suggest go see a surgeon or a gastroenterologist who could tell you exactly what is wrong after a physical exam.
Till then avoid fatty foods and eat light meals.