I'm actually going through this now! I'm 9 weeks and the nausea won't quit. I'm working FT and gagging into the trashcan between classes. My mom had four (3 girls / 1 boy) and said that her MS actually got worse with each one! hmmm...
I hope I don't sound judgmental here, but I really wouldn't take medication while pregnant. There is just no evidence that they don't effect the baby, although everyone says "it's fine". I'm sorry, kids today are NOT fine. There are far too many allergies, learning issues ,digestive issues, etc and I'm skeptical about the role that meds play on developing systems. No research has (or will ever be) done to conclude that there is no effect.
That said, I've never had such diabolical MS that I was incapacitated, losing weight, etc. There comes a time when you have to weigh risks/benefits. I can say (only anecdotally) that many friends of mine who I know took meds all the way through their pregnancies, are constantly posting on FB about their kids being sick. It's like, their regular state - ridiculous! I just have to wonder if there is a correlation there...
Here are some natural ways that have helped me cope. I'd try them all before meds. Some days some work better than others.
1. For me, it's always worse on an empty stomach. Even if I don't feel like eating (and lately, almost EVERYTHING has been a turn off!) I try to get something small down first thing in the morning. Smaller meals through the day are better than infrequent large ones - they will stabilize your blood sugar and keep nausea at bay.
2. Supplement w/B vitamins (or eat foods rich in them & iron). Sometimes MS is bc of dietary deficiencies and these vitamins have been implicated. They are water soluble, so anything your body doesn't use will be eliminated with you urinate.
3. Try to get more sleep - a laugh, I know!! But it does help me when I can't get relief...
4. GINGER. Trader Joes has wonderful Reeds Ginger Beer (no alcohol) that is ginger ale w/out the chemicals. They also have ginger chews that are great at helping to quell nausea. I keep these in my desk drawer at work.
Sometimes just the scent of ginger can help - I have a ginger body scrub from Origins and I love it for this reason in the morning!
5. Seabands. They are available at drug stores or you can make your own w/some elastic and a button. You wear the button side on the inside of your wrist. This is an acupressure point that helps with the queasies.
Every pregnancy is so different and unique. I hope some of these help and that you get some relief soon, mama!
Good luck!