Thanks everyone.
I will see how she is through the night, if she still has diarrhea in the morning i'm going to ask for my regular vet to do some blood work (I havn't been able to see my regular vet either yesterday or today because he has been busy with surgeries so I had to either wait for hours or see one of the other vets, as she really isn't well I didn't want to wait around.
At the moment she is lying in bed with me, but she keeps changing the spot she wants to sleep in so I think she may be uncomfortable
I'm just so worried and wish I knew what was wrong!