Why do I have severe abdominal pain and nausea?

These could be symptoms of gastroesophageal reflux disease (GERD) with nausea and acid regurgitation. It is advisable to visit a gastroenterologist for medical assessment and management.

If the patient has not experienced relief from their symptoms after 48 hours of following the prescribed medications, it would be advisable for them to contact their physician for further evaluation. . In the meantime the patient can try avoiding trigger foods, eat smaller meals, stay hydrated, and manage stress. 

It's great that you went to the hospital and received treatment for typhoid, malaria, and a cold. Some of these diseases might be responsible for one to feel unwell. Headaches and vomiting can sometimes stick around even after treatment. Ensure drinking lots of water, plenty of rest, and healthy foods. If your symptoms don't get any better, go back to your doctor to get more advice. 

Experiencing pain, blood, and a burning sensation during or after a bowel movement could be due to various reasons such as anal fissures, hemorrhoids, inflammatory bowel disease, constipation, anal infections, or other concerns

The value of 61 mIU/ml for your HBs antibody is good! In other words, your body won with a hepatitis B virus infection. Hepatitis B is a virus that puts the liver at risk and may lead to yellowing of the skin, tiredness, and stomach pain. You are safe from the hepatitis B infection with your current value. 

Your wife's biopsy re­port flagged potential Crohn's Disease­ after her appende­ctomy. This inflammatory bowel condition impacts intestines, causing abdominal discomfort, loose­ stools, and weight fluctuations. A colonoscopy inspection could confirm diagnosis. Following up with your doctor remains vital for compre­hensive evaluation.

It is apparently that urine injection syrup you have taken without diluting it. This can cause vomiting as a side effect. The major factor is the irritation of your stomach. To help, drink plenty of water and rest. If the vomiting persists or the condition is severe, there is a need to see medical help immediately.