Drink plenty of water. Your body can almost always handle water, and if you throw it up, it's not at all bad. It's not acidy, it doesnt stink, it just... comes out.
Start eating some basic food. Some real plain food. Lentils, Rice, Pasta, all in small amounts. Eat little and often now, and try to get a bit of protein in with it. Cottage cheese would probably be the best source of protein right now because your stomache finds it real easy to break it down. It's basically just a light sauce and an easily broken down solid.
Taking a tiny multivitimin could be taken once a day - but make sure it's the small type. The ones that you take 2-3 times a day. You wont be overloading your body with nutrients this way, and you'll benefit a great deal from it.
Keep your mood up! When the mood goes down, you'll feel worse mentally and pysically.
Good luck with it man