Mild fever with body pain and headache is often due to a viral infection. Take rest, drink plenty of fluids, and you may use paracetamol for fever if needed. If symptoms worsen, high fever develops, or it lasts more than 2 to 3 days, consult a doctor.

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.

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.

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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.

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.