I had gastro too about the same stage in pg as you. I went to the ER at the hospital (it's only over the road for me lol!) and they put in on a drip to rehydrate and gave me some anti vomiting stuff in the drip too. Wow I felt a million times better after that! Just go along, you won't look silly. It's important to keep hydrated when pg, particularly in the 3rd tri! Good luck and hope you feel better soon.