For severe nausea you can get anti-nausea tablets from GP like Ondansetron, Metronidazole and Domperidone but they stimulate the central nervous system, so can make any adrenaline surges worse, they did for me - although mine was caused by oestrogen surges (up I think). The only things I found that helped were strong anti-histamines like Citrizine, but they do make you drowsy, but they slow down any churning, and Emetrol which also slows down digestion - however, you can't get it in the UK so only on Amazon which works out quite pricey. Very cheap though OTC if you live in the US or Australia.
It does sound like an over stimulation nausea as its accompanied by dizziness, so ginger for example can make it worse as it causes stimulation, but if its from slow transit, which high progesterone can cause, then the Domperidone (Motilium) or antacids meds may suit you better.
Hopefully it will settle once your body gets used to the new hormones but these may help you in the interim.