Having a fever, chills, and loose motions for three days suggests a gastrointestinal infection. Your priority should be hydration. Drink Oral Rehydration Salts (ORS) solution, coconut water, and clear broths to replace lost fluids. You can take Paracetamol to manage the fever and chills. Please avoid self-prescribing antibiotics or anti-diarrheal medications, as they can sometimes worsen the infection. Eat a bland, light diet consisting of bananas, rice, and toast. Since your symptoms have lasted three days, I highly recommend consulting a doctor for a proper evaluation. Seek immediate medical care if you notice blood in your stool, experience severe abdominal pain, or cannot keep fluids down.