I'm at 13 weeks today and have been feeling better for about a week. I was pretty miserable for awhile so I can relate. My midwife told me to stop taking my prenatal vitamins because they can upset your stomach. She also suggested white things....white bread, white rice, milk, vanilla icecream, cottage cheese, etc. I ate yogurt ALL the time. Ice cream was really good too. Lime/Lemon popsicles tasted pretty good and helped soothe my stomach (as well as smelled good!!) For some strange reason, I couldn't stomach just plain water, but lemon mineral water was good.
I agree with the other posts that say to eat as much as you can right after throwing up. It does sound strange, but that was really the only time I could eat well and if I didn't eat, I felt even worse.
Get out of the house as much as possible. I know it probably sounds impossible, but I found that the change of environment and some fresh air made a big difference...even if I only had the energy to be out for a half hour.
Good luck and just remember that it WILL end!!! It's happening for a good reason. Having morning sickness means that you are VERY VERY unlikely to have a miscarriage so try to think about the healthy baby you're growing! The baby doesn't need much food at this point, so just take care of yourself. These are some of the thoughts that kept me going...
One last suggestion...call a friend, doctor, midwife, anyone who will be supportive and understanding and just let out all your frustrations and pain and fears...cry if that makes you feel better. We had a high phone bill the month I was feeling worst! I just needed to talk to all my close female friends. They always made me feel better and then shared stories from their lives to help me think about things other than my nose and stomach!!!