I am 8 weeks and I am so nauseous that I don't want to eat at all. The only reason I eat is because 1pm I feel shaky and I know I have to eat so I force myself to eat. When I start eating the nausea goes away but 30 min after I eat it comes right back! This is so weird for me never had this with my first 2 pregnancies.
I went through this pretty hard-core weeks 5-9. The only thing that really helped was absolutely forcing myself to eat ANYTHING. I found I could tolerate pretzel chips, so I'd snack on them basically non-stop all morning. If there's a little something in your stomach, you'll feel less nauseated. I know it's hard to do, but it does work. I couldn't always manage to make myself, but when I did, I felt better.
If you are able to eat in the evenings, try to get some protein and carbs in your stomach right before you go to bed, and even in the middle of the night if you wake up (bread and cheese, peanut butter, etc). I would feel much less sick in the mornings if I had something in my stomach over night, and then I'd be able to eat a little in the morning, staving off the empty-stomach-nausea and not setting off that chain-reaction where I'd feel sick, so I couldn't eat and then feel sick because I didn't eat.