Indigestion can indeed be a common adverse effect of some antidepressants. Gaviscon syrup is generally safe and may relieve the pain caused by acid reflux. However, it is always better to check with your healthcare provider before you take any kind of medication. They can give you individualized advice based on your particular antidepressant and general health. However, try some habits like eating less and staying away from triggers like spicy foods. 

From what you have described, your son may be having a gastrointestinal infection based on the recurrent gastric pain of fever and vomiting. Your son should have a comprehensive evaluation and treatment by an experienced gastroenterologist. The specialist may recommend further testing like endoscopy or imaging studies to determine the root of the problem. It is advisable to seek medical attention early in order to avoid any complications.

Your stomach might not be breaking down food properly. Try ginge­r tea - a helpful tonic. Ginger promote­s digestive enzyme­s, aiding digestion. Sip ginger tea afte­r meals, and see if it make­s you feel bette­r. Also, eat slowly, and chew food well. Simple­ tips can improve digestion.

You might have serious internal injuries. If you cough up any blood, have chest pain or trouble swallowing, or cannot see clearly, you should be concerned. Ingesting Harpic might have hurt your esophagus and stomach even more. Internal bleeding or other complications could be why these symptoms are occurring; therefore it is vital that you seek immediate medical attention.

Typhoid causes high fe­ver, weakness, stomach pain, and poor appe­tite. It comes from the bacteria, Salmone­lla typhi. Even though the fever's gone­, you must finish antibiotics. This gets rid of bacteria fully and stops it from returning. So take­ medicine exactly as the doctor said.