tracy give it a couple of weeks, let your body get used to the minimal calorie level. I started walking round the village, then extending it, then riding the bus to work and walking back homecouple of days per week, then everyday, then cycling round the village plus a bit, and now cycle round trip to work each day and in to town at weekend. Done it in, sun, rain hail fog and gails now in just a few weeks. I will keep this up, only thing is snow, doubt ill cycle then.
Take your time, build up slowly.
It does make you feel better and it addds a little bit of achievement to your day. ie. its not even 9am and I have cycled 6miles. To me thats amazing 3 months ago I couldnt have imagined doing that.,