Ummmm take a break and SIT DOWN. Call your doctor and let them know as well. I don't remember feeling like that when I was 10 weeks. Mind you, I just finished cosmetology school about a week ago. I wasnt pregnant when I got there lol. But I pushed through 2 hour bus rides twice a day and I walked around for as long as I could. My pregnancy didn't really it me hard until I hit 8 months. I was still able to do clients until 9 months. Then my floor manager demanded that I sit down somewhere or have someone help me.
But yeah, you'll be alright sugar. Your going to be feeling all types of aches and pains but it's all worth it ;)
Sciatic pain. Its probably the baby sitting on a nerve. You should definitely try to rest and sit every once ina while and drink plenty of water.