losing weight and nausea


I'm 11 weeks and 2 days and the nausea is horrible, this is baby #3 for me and it's never been this bad before. I have lost almost 16 pounds but not throwing up just can't eat and I'm also nursing my 16 month old. I'm exhausted and feel horrible none of the natural remedies are helping. anyone have any tips our tricks to get calories in me? I'm desperate!