For temporary relief from gas, you can take over-the-counter Simethicone. For the lower abdominal and back pain, an anti-inflammatory pain reliever like Ibuprofen or Acetaminophen may help, especially if the pain is related to your menstrual cycle or digestion. However, because combined lower abdominal and back pain can stem from various sources such as urinary tract infections (UTIs), pelvic inflammatory disease, or gastrointestinal issues, it is crucial to get a proper diagnosis. Please consult a doctor for a physical exam. Seek immediate medical attention if you experience severe pain, fever, nausea, vomiting, or changes in urination.

For gas-related pain, over-the-counter medications like simethicone or activated charcoal can help disperse gas bubbles. Avoid NSAIDs like ibuprofen, which can irritate your stomach lining. However, stomach pain from malnutrition is a serious medical concern that cannot be self-treated. It can be caused by stomach shrinkage, muscle wasting, or nutrient deficiencies. Reintroducing food too quickly can lead to a dangerous condition called refeeding syndrome. You need an immediate medical evaluation and a supervised, gradual nutritional plan. Please consult a healthcare professional to safely address the underlying malnutrition.

Since a 'stomach issue' can mean several things, it helps to target your specific symptom. For heartburn or acid indigestion, antacids (like calcium carbonate) or famotidine can help. For gas and bloating, simethicone offers relief. If you have diarrhea, loperamide or bismuth subsalicylate are effective, while mild constipation is best treated with polyethylene glycol or fiber. Resting your stomach, staying hydrated, and eating bland foods also helps. These are temporary reliefs. If you experience severe pain, high fever, persistent vomiting, or symptoms lasting over 48 hours, please consult a doctor for a proper evaluation.