Totally agree with what the others have said, having your boss understand can make a big difference. I had to stay at home for 3 weeks (working from home) for other reasons in my first trimester, and I must admit, the food was soooo much easier to manage at home. Thrilled to hear others lived on chips & coke too! I'd been worrying that I didn't crave healthy stuff! I also went for lemon & ginger tea, marshmallows, breakfast IN bed before you get up makes a HUGE difference (my DH reckons he did that for 70 days lol!). Toast with a lemon/ginger tea was my routine. Plus eating small & often. I couldn't cope with a big meal at all.

Other things to try: pressing the acupuncture points on your wrist, smelling (not necessarily eating!) lemon, acupuncture itself (from someone reputable with PG) all helped me.... and just eating WHATEVER I felt like regardless of whether other people thought i was bonkers.

And totally agree, often your boss might guess anyway, so may feel appreciative if you come to them for a little support/understanding and together you can work out the best way to manage it.
Good luck with it!!