Ugh... Feeling extra icky. Advice anyone?

I'm 6 weeks pregnant with #2 and It's been a bit rough. I've been feeling this deep sickly nausea in the pit of my stomach. It barely lets up long enough for me to eat. I haven't vomited at all but I've still lost almost 10lbs in 2 weeks. (I'm a size 14 so it's not that bad, but still) Also, I can't sleep even though I'm completely exhausted. Anyone have any advice? Anyone in a similar situation? Last time around I barely had any symptoms at all. Why is this one so different?