I've found I need to eat frequently, small meals and then snacks in between.
The extra saliva thing can be a pregnancy symptom I think. I remember there was a girl on 16 and pregnant who carried around a cup to spit in all the time b/c she had so much saliva and constantly swallowing it made her nauseous. Weird!
I'm always hungry, and need to eat so I don't feel nauseous, but I'm at the point where most of the time I couldnt' care less about food. I feel like I'm out of ideas of what to eat, and I just want waffles and anything else that I can douse in maple syrup - yum... french toast sounds good. I'm not worried about weight at all. I lost 6 during my first trimester with my first. I haven't lost now, but I'm nowhere near as sick - so that's WONDERFUL. And I'm nursing, and if I can get some energy back, I'll be back in the gym. But ya, this mama needs a lot of food!