Yes I had phenergan for hyperemesis (extreme ms). What I found was that to begin with they made no difference at all(nor did the suppositories I was given to avoid the oral route cos couldn't keep anything down)but after a spell in hosp on a drip, they did work. Took 3 tablets a day to begin with, then down to 2 a day for rest of pregnancy - they stopped me barfing but didn't kill the nausea completely.
As for vitamins,they were so enormous (I took sanatogen ones) I couldn't face them until about week 14. Even the little phenergans made me gag before that!
Now have 2 beautiful, healthy dds(2 sep pgs, not twins). It IS worth it when they arrive! You have my sympathy now though.x