That is a high grade fever and I would advise you to undergo further investigation such as CBC, peripheral smear and Dengue IgM to rule out any underlying problems. You should have antipyretics, antacids and antihistamine to control the current condition. The following steps may be of some help:
- Avoid cold food and water, preferably have hot food and water
- Don't skip meals have a liquid diet containing soups and progressively increase to solid diet as per how you can tolerate.
- Have food rich in
vitamin C such as oranges to help build immunity.
- Drink plenty of fluids, drink 3 liters of water per day
- Do salt water gargling with lukewarm water thrice a day
- Do steam inhalation (plain steam) thrice a day and apply vaporub over your chest and nose
- Maintain good personal hygiene(Wash you hands regularly)
- Rest plenty, body heals while at rest
If the condition persists or worsens visit nearest ER at earliest