Severe Weight loss? ?

I am rapidly loosing weight I'm unable to eat properly sometimes the shear sight of food makes me feel sick. I have to literally force some food down me, I'm a full time mum of four young children so always running around after them cleaning up and doing normal day to day things. And not eating properly obviously makes me feel quite tired which obviously isn't good =/ when I was younger I was severely anorexic but now I'm a healthy size 14 and have been for a few years. Really not sure what to do, any suggestions?