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.

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.

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.

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A high fever of 104.6F is significant and should be evaluated by a doctor. Basic tests usually recommended include CBC (complete blood count), malaria test, dengue test (NS1/IgM), typhoid test, and urine routine examination. Meanwhile, give paracetamol for the fever and keep her well hydrated. Seek medical care if the fever persists or worsens.

Fever since yesterday that has not improved may still be due to a viral infection, as these can take a couple of days to settle, even with medicines. Keep taking rest, drink plenty of fluids, and continue basic fever care as advised. Eat light food and monitor your temperature regularly. If the fever persists for more than a few days or you develop other symptoms such as severe weakness or vomiting, consult a doctor for proper evaluation.