A question about fever and some of its related symptoms?

Whenever i have a fever i have some symptoms which i would like to ask some questions about.
Today i found out that i am not alone in this.
They are:
– Numbness in my hands, they feel as if they are huge and are made of sand (when i rub them together i also feel this sandy sensation).
– Things in my bedroom (like ceiling lamps, curtains, windows) seem to be both very distant and very close, in the same instance.
Both things usually last only about fifteen to forty-five minutes.
Does anybody know what causes these weird symptoms?
I hope i explained what i mean correctly.