Another vote for the bands here too - am now 16 weeks with my first and was in the same boat as you not that long ago! The ones with the little click plate are ideal, so you get steady pressure but can also 'click' the disc against the pressure point rapidly if you feel a particularly vile surge coming on.
If ginger isn't working for you, try peppermint. There's a school of thought in holistic medicine that suggests that some people don't suit 'hot' remedies like ginger and are better with 'cold' ones like peppermint and vice versa.
Don't worry about your diet at this point, your baby will take what it needs with no regard for you! Eat whatever you can keep down. Starchy, carb-loaded foods seems to be the general consensus for stuff that is easy to stomach. Drink as much fluid as you can, even if it comes from sucking ice cubes rather than drinking water if that makes you feel sick, as said above.
The tiredness is also your hormones going into overdrive. Don't fight it, that will just make you feel worse! Try to rest as much as possible - this is one of the few times in your life where you can do so guilt free, because your body needs rest to help give its best for the baby. And tell anyone who whinges at you that they aren't creating a whole human being, so they can sod off! 
It does get better, honestly. It's hideous while it lasts, so don't be afraid to ask the GP for anti-nausea meds if you need them. There are several that are safe to take in pregnancy. Head over to the Hyperemesis Support thread for sympathy and tips too, sometimes it helps to know you're not alone!
Hugs and 
for you for now.