I have emetophobia (phobia of vomiting) and also (thinkfully) a good, understanding GP. Had already discussed this with him at the point that we were trying to get pregnant. He reassured me that there are treatments you can take for MS.
When I started feeling sick in my first pregnancy (at around 6-7 weeks , ooopsyoopsydaisy) he was brilliant and prescribed 25mg tablets of Phenergan, which worked well for me (still felt sick and tired/nauseous much of the tired, but never got anywhere actually near being sick, which is what I fear most - just ate lots of Carr's water biscuits - yummy!).
Second time round I bought the same medication over the counter - called Sominex - only it's 20mg, but it seemed to do the job just as well for me again. Don't tell the pharmacist it's for MS as they won't sell it for this purpose - I said it was for DH who couldn't sleep!
It's sold as a sleep aid, but is also an old-style anti-histamine and travel sickness remedy. Take it in the evening. May also aid sleep (Yay!), or cause drowsiness (Boo!), though I never found it seriously knocked me out! Was permanently knackered anyway!!
Stopped taking it at about 14-15 weeks when the feelings of nausea just went. Oh and both babies are very healthy indeed btw - will would do exactly the same again when if it happens . Planning already!! And to think I nearly catergorically refused to get pregnant for fear I might vomit...
Hang in there - it will get better!