Hello. Your symptoms suggest a respiratory infection, such as a common cold or sinus congestion. Yellow phlegm is common and doesn't immediately mean you need antibiotics, so please do not worry.\n\nFor relief, you can use these over-the-counter generic medicines: Paracetamol or Ibuprofen to reduce the fever and relieve your headache. Guaifenesin to help thin and loosen the yellow phlegm. Pseudoephedrine or a saline nasal spray to clear congestion. Be sure to drink plenty of water and rest. If your fever lasts more than three days or you experience shortness of breath, please consult a doctor for a physical evaluation.