Ok, So I'm Mot Sure How To Start This. For

Ok, so I'm mot sure how to start this. For the past week or so, I've been vomuting heavily, can't stand my favorite foods, and generally altogether miserable. I have taken pregnancy tests with all negatives, but I am 100 % sure that these are the same symptoms I had when I was pregnant with my daughter and had hypermesis gravidarum. Tonight I have been shaky, vomiting, and dizzy. Still negative test as of this morning. Should I go to er? Woyld they be able to tell me definitively if I am pregnant?