I had this very very bad and ended up going to the after hours more than once. I honestly thought I couldn't have coped with 9 months of it and was terrified it was the start of a miscarriage. Well it was shingles. The moral of this story is try not to worry, what will be will be, and what could happen might be the furthest thing from your mind. BTW the doctors all said it was normal for pregnancy and I'm sure for most people it is.
You will experience back pain, nausea, headache, fatigue, etc... it's normal to have all those symtoms..
Congrats and take caer