First, CONGRATULATIONS!!!
OK. Here's some things to try...
1. Acupuncture
2. Red raspberry pills / tea
3. Pregnancy Tea (Traditional Medicinals)
4. Ginger beer (I like the Fever Tree brand best, less sugar, more ginger)
5. Crystallized Ginger
5. Saltine crackers (Especially first thing in the morning)
6. LOTS of sleep / rest (Often nausea is due to being so tired, your digestive system can't function properly especially if it is happening after you eat.)
7. Eat the minute you feel hungry
Given the severity, I would go for acupuncture first. I have been seeing an acupuncturist, but she has been more focused on balancing my overall energy because I haven't actually thrown up yet. However I find I feel less nauseous for a few days after seeing her. She has told me she has a treatment that will work immediately if I ever actually toss cookies. I am currently taking Solaray's Red Raspberry pills, drinking ginger beer, and carrying crackers with me everywhere I go :) Hope these ideas help!
P.S. I will be 9 weeks tomorrow and like you started with the nausea close to 7 weeks. My other 2 pregnancies, I only needed a little red raspberry, but this time the twins are making it worse... Silly little beans :)