Since you have had a fever for 15 days with chills, headache, weakness, and poor appetite, this is considered a prolonged fever and needs proper evaluation to find the exact cause. You should avoid changing medicines on your own and instead consult a physician with all your previous reports. Your doctor may advise tests such as Complete Blood Count (CBC), malaria test, dengue test, typhoid test, ESR/CRP, and blood culture to identify the cause. Stay well hydrated and take adequate rest, as persistent fever should not be ignored and may require specific treatment once the diagnosis is confirmed.

For your high fever, you can take Paracetamol (Acetaminophen) or Ibuprofen to help lower your temperature and ease body aches. For the dry cough, an over-the-counter cough suppressant containing Dextromethorphan can help quiet the cough reflex. Please rest, drink plenty of fluids, and consider taking a COVID-19 or flu test, as these are common causes. Avoid taking antibiotics without a prescription, as they do not treat viral infections. If your fever persists for more than three days, or if you experience shortness of breath, chest pain, or difficulty breathing, please seek immediate medical attention.

A sudden move from a cold to a hot, humid climate can sometimes cause mild fatigue or heat exhaustion, but it usually does not cause a high fever. Since she had multiple mosquito bites and now has fever with weakness, a mosquito-borne infection like dengue or malaria should be considered if the fever persists. Monitor her temperature, keep her well hydrated, and give paracetamol if needed.

For sneezing and fever, you can take over-the-counter medications to manage your symptoms. To reduce the fever, Acetaminophen (Paracetamol) or Ibuprofen is highly effective. For the sneezing, an antihistamine like Cetirizine or Loratadine will help. You can also look for multi-symptom cold formulas, but ensure you do not double-dose on the same active ingredients. Please rest, drink plenty of fluids, and monitor your symptoms. If your fever lasts more than three days, worsens, or is accompanied by shortness of breath, please consult a healthcare professional in person.

Cold and runny noses that suddenly start are commonly caused by viral infection, weather changes, allergy or exposure to dust and pollution. Symptoms such as sneezing, watery nose, mild throat irritation, and pressure in the head often improve within a few days with supportive care and rest. Doctors commonly use antihistamine medicines such as cetirizine or levocetirizine to reduce sneezing and a runny nose. Some people also use a combination of cold tablets for nasal blockage, headache, or body pain, depending on symptoms. Warm fluids, steam inhalation, proper sleep, and avoiding cold irritants may also help reduce discomfort naturally. Antibiotics are usually not needed for a simple cold, because most cases are viral. Drowsiness can occur with some cold tablets, so caution is needed while driving or working. High fever, breathing difficulty, chest pain, thick yellow mucus or symptoms lasting many days may indicate a more serious infection and may need proper medical care.

Fever that comes mainly at night can be due to viral or bacterial infections. Monitor your temperature, stay hydrated, and take paracetamol if needed. If it lasts more than 2 to 3 days or is very high with chills or weakness, see a doctor for proper tests and treatment.