Hi,
Welcome to the forum. I am really glad to help you out. The symptoms which you have described are suggestive of gastritis/ GERD due to acid reflux from the stomach. It is usually after eating a heavy fatty meal and sedentary lifestyle. It can also be caused by drinking too much alcohol, prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs) such as aspirin or ibuprofen, or infection with bacteria such as Helicobacter pylori (H. pylori).
Eat small nutritious meals at frequent intervals instead of a heavy single meal. Exercise frequently and take your dinner atleast 2 hrs prior to bedtime.
Take some OTC antacid like Mylanta. You can also take ranitidine or omeprazole. Also keep your fluid electrolyte balance optimum by drinking lots of fluids.
If the symptoms worsen then it may be due to H.Pylori infection.
You need antibiotics in that case after prescription from a physician. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.