Fever for 4 days, gone for 3 days & today its back. I woke sweating a lot with chills, have a headache and sore throat, dizzy, hot skin around neck

Periodic fever. A thorough history and physical and labs are required to properly diagnose the cause of your symptoms. The differential diagnosis includes infectous diseases and rheumatologist or autoimmune conditions.
See a doctor. You really need to be seen and examined. I would do some blood work as well.