Nope. They really can't even find out where you live, just the location of the isp place thingy... Least from what i know of they can't. So you're fine.
nope, they can only stalk you down and rape you. On the serious note, stop being so nervous lol, no one is going to do something malicious for no reason.
I'm not very good at this stuff. But I am pretty sure you cannot be hacked just from someone knowing you IP address. If you could then almost anyone could hack you considering website owners can see your IP when you are on their website.