Not a good start to the day

Headed out to do week 2 day 2 today, woke up feeling really tired but got my running stuff on and went out anyway, I started out well but as I got further into the podcast I started to feel sick and by the end I had horrible stomach pains too!  Uh oh I hope its not a bug or something.  I got through it but it was pretty horrible and I feel dreadful now.  Plan for the day is to lie on the sofa and do nothing until I have to collect the kids, fingers crossed it disappear sharpish as I had planned swimming tomorrow and another run on Friday.