Your symptoms of severe weakness, loss of appetite, and frequent bone pain can occur due to several conditions such as vitamin D deficiency, anemia, infection, thyroid problems, calcium deficiency, or other medical issues. Since your medical report is not available here, I cannot safely recommend a specific medicine. Maintain good hydration, proper nutrition, and adequate rest, and avoid self-medicating with painkillers regularly. Seek medical attention urgently if you also have fever, weight loss, swelling, severe weakness, or difficulty walking.