I've asked this before sorta, but I need more opinions.

I'm 17 and a female, (if that helps any) and for a couple of months now. Just very randomly but at least once a day. My stomach will feel really unsettled. It doesn't feel like I need to puke...but once in a great while I will feel like I need to, but I never do. I haven't had sex in almost about 10 months so...its not preganancy.

What the heck is this? Nerves? And WHAT CAN I DO TO SETTLE THIS? =(