Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM).
Burning sensation and nausea and discomfort above belly button suggest Acid peptic disease
or GERD (Gastroesophageal reflux disease
For this take a proton pump
inhibitor like rabeprazole
along with a prokinetic agent like domperidone
Few more tips:
1.Avoid fatty meals
2. Don’t lie down soon after meals for at least half hour
3.Take small and frequent meals, instead of full meals at a time
4. wear loose clothes
5. If you are overweight or obese do weight reduction with dieting and exercise
I hope I have answered your query and this will help you. If you have any further query I will be happy to answer that too. Remain in touch and get-well soon.