Unexplained Exhaustion

I've never felt this exhausted in my whole life...not physically, but emotionally. It drained my energy to the highest level and made it hard for me to cope up with things. Most of the time, i tend to deny it, but things came out of proportion before i could even do something about it. And now, I can feel the burden on my shoulders getting heavier each day, and they are pushing me down on my knees. I'm not sure until when can I carry this... It is starting to eat what remains of me.