Headache, sore throat, fever, rashes all over body, virus?

Last week I started having a headache and slight sore throat . It turned into a fever later that night and reached 104. It came down to 101- 102 and remained for about 3 days. When the fever subsided I had a heat like rash all over my body (worse on my hands, knees, and face), and a numb toe . Now my 4 year old son has a fever that reached 104 and is around 99-101, complains of burning eyes, head ache and numb toes. He has no rash yat but his fever has not broken either. Is this a virus such as fifths disease or some other virus or something else?