HI, thanks for using healthcare magic You more than likely have a viral infection. The freezing is chills which occur along with a fever. Fever with chills. Though it is natural to want to bundle up when these chills occur, you are actually raising your temperature, worsening the fever. You need to bring your temperature down. Using the ibuprofen is fine (consider combining with paracetamol), you should consider wiping down or taking a bath with tepid water and after wear as little as possible to help reduce body heat. A decongestant would help with the blocked nose and the medication for the fever should help the sore throat. If a cough occurs then cough medication is also available over the counter. I hope this helps