Fighting fatigue

Since I confirmed my pregnancy, I have been fighting a losing battle with fatigue. This is simply one of the reasons why I do not want to be pregnant again. I need my energy to fulfil the demanding responsiblities of a wife, a mother of two and manager of our business. Believe it or not, i can sleep standing. I'm scared if I would fall asleep while driving to work. Still hating my husband for getting me pregnant again. I couldn't take oral contraceptive pills as I couldn't stand the side effects. So, contraceptive measures was left at his side. I believe it is called "coitus interruptos". Yet, as unreliable as any man could be, he cannot control thus accident happens. Aargh! I'm so confused, angry, depressed.