Hey...congratulations! I'm just at the other end of the spectrum (40+1 today), but I remember those early days.
On the vitamin front, you might try taking it with food, if there's something that you can keep down. The vitamins can be hard on your stomach, particularly if they have lots of iron. I had some trouble with hemoglobin and found the iron tabs too killer, but am taking a liquid (Floravital), and that's much easier, even though it tastes vile. There are liquid multis out there too, but you might have to a bit of work to figure out how much to take, etc.
Ditto on trying not to let your stomach get too empty, as this usually increases the feeling of nausea. Also, don't worry about eating a balanced diet....not at all. If you can choke down the vitamins and keep them from coming back up, then getting calories in your diet is more important that getting your 5 a day necessarily. For me, saltines/bread, etc. were killer and made the nausea (and well, let's just say other symptoms) appear. Salty foods were very helpful, and I completely craved protein, so that's what I ate, along with buckets and buckets of orange juice. I can't believe orange juice helped my nauseous tummy, but it worked. Anyway, the idea is to eat whatever you can.
- make sure you take some snacks (something that is nausea safe) with you wherever you go. Not only can it help with the stomach troubles, but it can keep your blood sugar on an even keel, which can be troublesome if you're not eating a lot.
- maybe try ginger chews/candy. I had some that I carried with me for awhile. The taste was really strong at first and almost made me feel worse, but after a few seconds, it actually helped. Some gals like mints, but they made me puke.
- sea sickness bands help some women
- try having something safe available to eat on your nightstand, so that you can nibble literally before you even get out of bed and are upright/walking around. Or, you could of course get your other half to bring you something each morning
- be careful about how much water you drink at one time. It's important to try and stay hydrated of course, but too much water in your stomach can really make you hurl
How far along are you now? Hopefully once you get past that 12-14 week mark, you'll feel a bit more normal.