7 weeks - sick, nausea & starving all at the same time?!

I'm 7 weeks with my 3rd pregnancy (had 2 miscarriages last year) I felt fine with the other 2 which was probably a sign they weren't ok but this time I feel totally different which I'm hoping is good! I'm really struggling with constantly feeling sick and being sick but also at the same time I'm so hungry I get a stitch it my side and my stomach won't stop rumbling. I'm trying to snack on plain crackers etc but no food appeals to me and there's nothing I can face eating. Also being at work for 12 hours a day is really hard! Does anyone have any tips? Thanks x