Oh, @Imhereforthecake - I have HG, two step children under 10, a five bedroom house to keep clean, a 50 hour job and a husband that can't function alone... like you, I have no time for the luxury of lying down and crying about the vomiting.
I don't have many useful tips but I have some tips nonetheless.
In the day, if I must, I nibble on buttered crackers, which I add extra salt to (I think I may be having salt cravings?) but mostly I don't eat until after 8pm when I am then okay to sit still and digest. Movement makes the nausea worse.
Keep yourself cold. Warmth makes the nausea worse. Tie your hair up to help with this.
Keep showers short. Steam makes the nausea worse.
Add some essential oils to a hanky for sniffing. Outside smells make the nausea worse. (Vicks on a tissue also works) I have also added Vicks to my face mask because the fish counter in Waitrose is just not my friend.
Stick to cold food. Hot food makes the nausea worse.
Stick to gaviscon tablets - liquid gaviscon is nausea in a bottle and makes the nausea worse.
Drink from very very small glasses - like a shot glass (yes I'm serious). The thirst can be so intense that when you try to sip from a normal glass, animalistic instinct takes over and you down the pint in 2 seconds. Then you throw up. Pint glasses make the nausea worse.
You will be surprised at how much you can achieve, even though you feel like you are going to die. You will get through your 12 hour shift. I believe in you. Today I have worked 9-3, done 6 meetings, changed 4 beds, cut back a shrub, done the school runs, made dinner, made rice crispy treats, done 2 loads of laundry and finished the Christmas stockings... oh, and thrown up 3 times. I firmly believe we women have an enormous capacity to just "get on"
You go girl!