Don't worry -- it DOES get better -- LOL! With every pregnancy it's different, but for me, my first I was sick and fatigued until 20 weeks. The second (miscarried at 9 weeks) I was mildly sick until then... This is the third pregnancy for me and I'm at 12 weeks and have only been sick for about 30 minutes each day for the past two weeks (as opposed to several hours each day before that). So, for me it's getting better. And it will for you, too.
For my sister (who has 5 kids - 22, 21, 16, 15, and 7) the pregnancies and births DID get easier.
Good luck to you!