Since you have had a mixed cough for only three days, it is likely due to a common viral infection. For a wet cough, an expectorant like guaifenesin helps thin and clear mucus. For a dry, tickly cough, a suppressant like dextromethorphan or simple honey in warm water can soothe your throat. Avoid combining suppressants and expectorants. Stay well-hydrated and try steam inhalation to ease irritation. If you experience high fever, shortness of breath, chest pain, or if the cough lasts more than ten days, please consult a doctor for a proper physical examination.

For temporary relief from sinus pressure and headache, you can take Ibuprofen or Acetaminophen. For your throat pain, warm salt-water gargles and throat lozenges work well. For a severe cough, an over-the-counter cough syrup containing dextromethorphan (for dry cough) or guaifenesin (for wet cough) can help. Oral decongestants like pseudoephedrine can ease sinus congestion, but avoid nasal decongestant sprays for more than 3 days. Stay well-hydrated and rest. Since your symptoms are severe, please consult a doctor to get a proper diagnosis and ensure you do not need antibiotics.

For fever and body aches, take paracetamol or ibuprofen. For sneezing and a runny nose, an antihistamine like cetirizine is helpful. For a dry cough, use a suppressant containing dextromethorphan; for a productive cough, an expectorant like guaifenesin helps. To support your immune system, supplements like Vitamin C, Vitamin D3, and Zinc can be beneficial. However, the most effective natural remedies are staying well-hydrated, eating nutrient-rich foods, and getting plenty of rest. Please consult a doctor for personalized dosages.

For a viral fever, paracetamol is recommended to reduce fever and ease body aches. For nasal and chest congestion, saline nasal sprays, steam inhalation, and generic decongestants like pseudoephedrine or mucolytics like guaifenesin can help clear mucus. Since you have a chest and nasal infection, a doctor must evaluate you to determine if these are viral or secondary bacterial infections. Do not take antibiotics (like amoxicillin) without a prescription, as they do not cure viral infections. Please rest, drink plenty of fluids, and consult a healthcare professional for a proper physical exam and tailored prescription.