I know exactly how you feel hun, I fell pregnant (planned) when my first was 11 months old (nearly 12 months).

Its realyl difficult, but just try to do all the same old stuff. Have the cuddles, and remember that your baby is so safely tucked away in there. As webmeg said, mother nature will look after you.
My son kicks me and pokes me and sits on my big belly now... I do try and avoid it, but i cant stop my first child having his normal contact with me.