Ive been down with some kind of bug since Tuesday. I play Pokemon Go and I went for a walk in a local park, and I was practically dropping from tiredness by the time I got home. I haven't been sick, but I feel very sick - my cat kept walking on my stomach while I was in bed and I wanted to kill him, I felt so awful - and I've had diarrhoea. My arms and legs are also really shaky - I went for a walk to pick up my mum's birthday present today and my arms and legs felt really horrible, really wobbly and shaky. It was all I could do just to spread hummus on a bagel I was having for lunch. Is this a norovirus thing? And would I be safe to go to the gym tomorrow?