Virus?

Just to save you asking, this is a picture, heavily mutilated, of a virus.

For the past few days I've had the strangest feeling in all my muscles.

They hurt to move, they seem to be weaker.

Things I can't really do :

• pick up a tiny little baby
• squeeze my toothpaste out without using two hands (even then it's a struggle) (the tube is nearly new)
• pick-up a full kettle
• type. (other than with two fingers, moving my whole hands)
• walk up/down the stairs without a bunch of pain

Otherwise I feel fine. Nose/throat/eyes are fine. My mind is as sharp/crisp as ever.

I am hoping that this is just an odd virus / post-viral thing. If it isn't then I'm getting very scared.