Why do I have on and off diarrhea?

The alcohol likely irritate­d your stomach, which can occur when consuming a lot. Throwing up blood might indicate a blee­ding stomach ulcer. Look out for stomach pain, dizziness, and fee­ling faint. It's important to stay hydrated and avoid alcohol until you're fee­ling better. If it persists, se­ek medical attention right away.

If you consume a fly that has landed on a food item, then you may become unwell. Flies are the source of growth factors (germs) that can cause you to get sick. In the aftermath of eating contaminated food, you may encounter stomachache, vomiting, and diarrhea. For recovery, you should drink adequate water, take some time off, and not eat more of the same food.

A CT scan will help reveal any serious underlying condition that may cause abdominal pain. It is recommended to see a gastroenterologist who can evaluate you, ascertain the cause and design the plan for the management. Consequently, I recommend you see a gastroenterologist for further testing and treatment.
 

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. 

The possibility of bloating and shortness of air can be caused by some digestive and respiratory system\disorders. These symptoms, including the temporary lack of consciousness, may pose a risk for a more severe problem. Urging immediate help from a doctor should be the first step to diagnosing the problem precisely and getting the right treatment.