There isn't a specific treatment for dengue fever, but your body will usually fight off the virus by itself after 4-7days. In the meantime, you should make sure you rest and drink enough fluids. Your doctor may suggest that you take oral rehydration therapy(a solution containing salts and other substances) to help prevent you becoming dehydrated. You can take paracetamol to help relieve your pain and reduce your fever, but you should not take aspirin or ibuprofen, as these can worsen any bleeding you may have. Always seek professional advice before taking any of these measures.
Attribution: BUPA