Mine was immediate - it was too early to even do a POAS. Both times.

Lasted until 32 weeks with DS1, and the entire pregnancy with DS2 (literally - I vomited the day he was born ... )

I hope yours passes quickly, and that you find some good solutions between now and then!!

Nothing helped consistently ... mineral water would a bit, then lemon sherbert bombs for a day, then nothing, then everything made it worse, then cucumber, then wearing sea bands, then nothing ...

Sorry!