It sounds like you are experiencing significant symptoms that could indicate an infection or other illness needing medical evaluation. Given your severe headache, fever, cough, cold, and prolonged sleepiness, it is important to see a doctor promptly rather than self-medicating.

For symptom relief, over-the-counter fever reducers like acetaminophen or ibuprofen can help reduce fever and headache, but these should be used cautiously and according to package instructions. The medication Levosiz (levocetirizine) mentioned is an antihistamine used mainly for allergies and is not appropriate for treating fever, headache, or infection symptoms.

Please seek evaluation from a general physician or an infectious disease specialist as soon as possible to determine the cause and receive appropriate treatment. If you develop worsening symptoms such as difficulty breathing, persistent vomiting, confusion, or severe weakness, go to the emergency room immediately or call emergency services.

If you want, I can explain more about managing your symptoms safely until you see a doctor.To narrow down potential causes, we will need some more information.I understand you're having a severe headache, fever, slight cough and cold and have felt sleepy for the past 2 days. Could you please share your age and gender?