Life to much to handle?

I have come to a point in my life where I feel as though I am under so much stress and I have had so many different hardships happen that I dont know if I can continue to cope. Im so depressed that I have not eaten anything at all in over 24 hours and I did not sleep last night. The thought of food makes my stomach turn. For the majority of my life I have been the under dog that never wins but I just kept trying my best, but each time I seem to be nearing success in my endeavors they end in catastrophe. I dont know what to do any more, I'm afraid to try anything ambitious, I'm afraid to reach for my goals and dreams the way I have fought for them for many years now, I can't deal with anything else falling apart in my life. What on Earth should I do?