Nervous over 2nd pregnancy?

Every pregnancy will be different. I had the easiest first pregnancy with my daughter, I am 31 weeks with my second girl and I felt like I have been hit by a truck this time around, I was sick, I started getting severe backaches at 22 week, haven't been able to sleep since about 24 weeks. I think it is normal to feel like a new mom again because the pregnancy is completely different and you can't relate it to your first, as well as you will be a mom to 2 instead of one, which is something you will feel nervous about and is new to you, I feel the same way.