How can i control my morning sickness?

seriously i have tried everything in the book, i nibble on saltines before i get up, i drink plenty of water,taking vitamins, i eat every 2-3 hours i do everything i ever heard of to help it but nothing is working and its so miserable i havent worked in weeks because of it. it lasts all day even when i try to sleep, i sware i never get a break! help!! i dont know how much longer i can take of this and im only 6 weeks pregnant. :(