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. 

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

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. 

Your girlfriend might be experiencing acute appendicitis. Symptoms of this are sudden stomach pain on the lower right side with swelling. Appendicitis is when the appendix gets inflamed. If you think this is the case, you need to go to the hospital straight away because surgery is usually the only way to get rid of the inflamed appendix and avoid complications.