I feel for you, just turning the corner on that myself. I'm 15 weeks now, and just emerging from weeks of incapacitating nausea - since I missed my period. With my first, I was mildly, 24-hours-a-day nauseated for six months. This was much much worse, but it looks like it's not going to last as long (knock wood.)
The bad news is that I doubt there's anything that's going to make it go away entirely. Only time will do that. There've been some great suggestions all down this list - your best bet is to try the ones that appeal to you and see what works.
Here's what has kept me functionally chasing after my 3-1/2 year old for the past 3 months:
Set your alarm 15 minutes early. Without even sitting up, eat something. 1/2 cup of cheerios, some crackers, whatever. Drink a little water to wash it down. Stay horizontal for 15 minutes. Then slowly try to get up, and eat something WITH PROTEIN asap. (egg, cereal w/milk, peanut butter toast, whatever.) (I laughed out loud when I saw this suggestion on the info sheet on nausea my OB gave me - it seemed so unreasonable to imagine waking up BEFORE my preschooler - but it actually worked for me.)
Keep a container of something (cheerios, crackers, whatever) by your bed at night and every time you wake up to pee or whatever, eat some and drink a little water.
Eat some food every 1-1/2 - 2 hours. With protein. Yogurt. Nuts or trail mix. Granola bars w/protein (I like Luna bars.) Bagel and cream cheese. Cheese and crackers. Apple and peanut butter. Soy yogurt. Do not let 2 hours go by without eating something. It doesn't have to be a lot, just eat something, whether you're hungry or not. Have a big bedtime snack (w/protein.)
Get enough sleep. (I laughed at this OB suggestion, too - the sheet they gave me said "at least 10 hours a day." HAH! But really, when I've gotten good sleep, the nausea was better - not gone, but better.)
Rest. (I know, laughter again.) Honestly, I started sitting on my butt a whole lot more. You know what? So the house isn't spotless. So there's a bunch of laundry to do. So your email inbox at work has 1000 messages in it. Just stop. Set your highest priorities, and let the rest of it go. As soon as I stopped trying to keep up my normal pace of life, as soon as I slowed down, it got better. Not gone, but better. Making a human being is hard work. Cut yourself some slack.
I was on 150 mg of B6 each day until last week. My OB told me you really have to take that much in order to get the theraputic effect. That's a 50 mg tablet 3/x day. You don't need to worry about getting too much - your body flushes out any excess it can't use in your urine. Again, this did not make the nausea go away, but it made the good days noticably better - and almost immediately. Speaking of vitamins, if taking your multivitamin makes your nausea worse, stop. Eat lots of super fortified foods instead (Total cereal, Luna bars, fortified soy milk, etc.)
And for those six weeks when I actually couldn't get up off the couch - Zofran. If it's really bad, get a prescription from your OB. You don't have to take it all the time, you only take it when you need it. I know several other moms who have taken it with their pregnancies and had good experiences. Most common side effects are a headache and constipation. I didn't get headache, but I did get constipated, but found by taking Citrucel 1-2x a day, that was taken care of.
I wish you luck - there were days when I felt desperate, like there was nothing I could do to make it any better - and those days, I took Zofran. Take heart, they do say that it's a sign of a well-established pregnancy. Knowing that it won't last forever doesn't help much when you're in the middle of it, but it's still true.