Morning Sickness/All day everyday

I'm just past 12 weeks and the doctor said that I would start feeling better and if it's possible I am feeling worse, the morning sickness/all day and the headaches keep me in bed most days which is really hard when we have two daughters already and my husband works away... I can barely shower myself or get groceries without fainting or being sick! Someone please tell me there's an answer or something that will help!! I want my energy and life back!!