I never found anything to work. With each new pregnancy I'd hear of a new "trick" and would think that surely it was the one thing that would work. I never tried the sea bands though. I'm thinking that the sea bands are not making it worse, but you're just getting along further in your pregnancy and the nausea is getting worse as you do. You will be feeling better in time. In the meantime, keep trying whatever you can and try to get plenty of rest. And, of course, try to eat small amounts as you are able, particularly before you get out of bed in the morning (saltines, graham crackers, whatever you can get down). The unsweetened iced tea might help some too. I feel for you---I've been there---5 times :)
Take care,
K.