A common cause of stomach pain may be appendicitis which is the swelling of the appendix that leads to discomfort. It could be shown in an ultrasound, but maybe not. Visit a doctor to be examined in detail and thereby the one who will advise you on the right treatment which is mainly prescription drugs or surgery to remove the appendicitis. Look for symptoms like worsening pain, fever, or vomiting, which could indicate a more serious issue. 

You might have an H. pylori infection. This bacteria can cause stomach pain, make your belly feel uncomfortable, and even cause a heavy head or cold sweats after meals. It can also lead to stomach ulcers. The good news is that it can be treated with a combination of antibiotics and acid-relief medication. Be sure to follow your doctor’s instructions and complete the full course of treatment to fully eliminate the bacteria. y.

From the blood test results, it appears that there are inadequate levels of iron in your system. This can cause vertigo and trouble digesting food. I suggest you add such foods as spinach, lentils, or red meat which are rich in iron to your diet. Also if the physician orders it, you may consider taking an iron supplement that may help alleviate these symptoms.

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.