Hi, Your symptoms of a high fever, hallucinations, and sore throat can be caused by various illnesses. It is difficult to determine the exact cause without a physical examination and additional information. However, based on your symptoms, you may have a viral or bacterial infection. A high fever is often a sign of infection, as your body temperature increases to fight off the illness. Hallucinations can also occur with high fevers, especially in children. The sore throat and difficulty swallowing could be a result of an infection in your upper respiratory tract, such as the common cold, flu, or strep throat. Phlegm and excessive saliva could also be a symptom of an infection. You doctor may recommend over-the-counter pain relievers, like ibuprofen or acetaminophen, to help with the fever and sore throat. Drinking plenty of fluids, such as water or hot tea with honey, can also help soothe the throat and keep you hydrated. Gargling salt water or using throat sprays may also help alleviate the symptoms. If your symptoms persist or worsen, it is important to seek medical attention immediately. In some cases, a severe infection can lead to complications if left untreated. If you require a personalized response, kindly use the Ask A Doctor service and post a follow-up. Take care. Hope I have answered your question. Regards, Dr. Priyanka, General & Family Physician