can't stop worrying


need some support.. Just wondering I am 7 weeks and a day pregnant and last weeks I was really badly nauseous and throwing up . then about 5 days ago it got so bad I was even up in the middle of then night .. now it seems that I'm hardly sick or feeling nasous at all for the past 2 days (including today) is it normal for symptoms to like be worse one week then not so bad the next ...had a missed miscarriage a year ago, really worried about having another.. breasts are still tender. but not as bad also.. Just worried maybe ??