Pain on the left side of the stomach below the ribs, which worsens when not eating, could be caused by various factors. It could be gastrointestinal issues, like gastritis, or pancreatitis, among others. It could also be related to kidney problems, muscle strains, or other conditions.But you need to get a proper examination done to determine the cause .

Discovering a worm in your stool might be due to a parasitic infection. Parasites can enter your body through contaminated food, water, or surfaces. Consult a doctor for diagnosis and treatment, maintain good hygiene, and practice food and water safety. 

If your blood test shows that anti-HBs is positive, it means that you have antibodies against the hepatitis B surface antigen (HBsAg). This result indicates that you are either immune to hepatitis B or have been successfully vaccinated against the virus.

The symptoms you mentioned might be associated with a condition such as trimethylaminuria (TMAU) or a gut issue known as small intestinal bacterial overgrowth (SIBO). TMAU refers to the main odor complications, while SIBO leads to bloating, gassy, and gut issues like diarrhea or constipation. It's imperative to obtain the actual diagnosis by carrying out tests such as breath tests or blood tests. The treatment may involve changing the diet, probiotics, antibiotics, or other medications that will help to control your symptoms. 

According to your symptoms of bloating, gas, diarrhea and stomach pain after consuming the leftovers you most likely have cases of food poison or intolerance. Generally, it is better to seek advice from a specialist and undergo testing in order to determine the root of your symptoms. In the meantime, follow simple diet

You won't find high blood pressure caused by stomach and acidity disorders. However, if you're often in a state of worry because of such a situation, it may have a slight impact on your blood pressure. Experiencing symptoms such as stomach ache, puffy belly, and heartburn can make you feel uncomfortable. You should eat less, avoid spicy foods, and learn to relax through techniques such as deep breathing or yoga, which will help you manage stress.

In many cases, the buildup of stool in the colon can lead to lower left abdominal pain caused by constipation. Constipation and left side pain can be prevented by increasing fiber intake, proper hydration, regular exercise. If the pain continues or if it is intense, one should seek help from a medical practitioner to clarify this further.