If you just drop them, you might wind up with holes in your work. You can 1, rip it out and start again or 2. "unknit" until you've gotten your original amount of sts back. The fact that you have so many that they won't fit on your needles makes me think it's better to just rip and start over. I wish I could help you identify where all those extra sts came from, but without being able to hold it and see it for myself, I can't say for sure because there are [color=red]numerous[/color] ways for sts to be accidentally added.
Hope that helps a little... :?