I've been in quite a lot of pain today (back and leg), so honestly I've not wanted to eat much

at breakfast time I tried to eat my food but felt really sick and nautious and couldn't eat it all- through out the day I've eaten little bits, and a small dinner (just a little toad in the hole with nothing else on the plate), but I don't have any appetite- not when I'm in so much agony I can think about nothing else.