I'm just now getting over something similiar, however i'm not from the UK, nor have I been recently. A few days ago I woke up covered in sweat and couldn't stop throwing up. Then 20 minutes later I would have the chills like crazy, even though i'm sweating profusely. The muscles in my legs were aching so bad I could barely stand at work so I had to take a bunch of pain reliever. I've had no energy for the past few days and I haven't eaten a solid meal since I started feeling like this.
Finally feeling a little better today (which is great because i'm getting tattooed at 6 today). Hopefully you start feeling better soon!