Have not slept in three days! Please help!?

I don't know what could have caused my sudden insomnia, I am no more stressed than usual, I do have caffeinated drinks but only 2 at most for the whole day, my diet hasn't changed and I do not have a lot of sugar other than my caffeine drinks...

My life has been pretty standard and without much change.

I am still getting tired but cannot shut off my brain, I have been drinking camomile tea and taking hot baths with muscle relaxing bubble bath but really don't know much else about forcing sleep...

I'm so exhausted, I feel sick and am afraid of a repeat tonight.. Has anyone got any ideas?