First trimester: morning sickness and fatigue

I am currently at 7 weeks and have been struggling to work normally. I have morning sickness which last till night, thank god for metoclopramide I am better. But there is also the fatigue which hits me, it's a different kind of tired altogether. I've never felt so tired, I normally take a few naps during weekends but during weekdays, I can't with work at office. How do you cope being at work during your first trimester? Please share some tips.