To manage your cold, prioritise rest and hydration. You can use generic paracetamol for body aches and saline nasal sprays for congestion. For your fatigue and low stamina, daily multivitamin supplements containing Vitamin D3, B-complex, and Zinc can help boost your energy levels. Since you have a good appetite, ensuring your meals are rich in iron and protein is also beneficial. However, extreme daytime fatigue can sometimes indicate underlying issues like vitamin deficiencies or thyroid imbalances. If your fatigue persists after your cold resolves, I highly recommend consulting a healthcare provider for basic blood tests to identify the exact cause. Take care and rest well.