Yesterday through the day I got very achey and tired. I had an early night but was up all night with a hot and cold sweat and coughing. My whole body is hurting. This morning when getting up I can barely walk 10 steps without feeling like I'm going to collapse and both of my hands and arms started really tingling and got extremely cold. I also keep having to rush to the toilet. Is this flu? I've never had it like this.