Q: My ipod is acting like it has headphones in it, but doesn't! the sound doesnt work without headphones now..

Reset it

1. After charging till full charge, at least 2 hours (preferably 4 hours)
2. Toggle the Hold switch, make sure you dont see the red mark when you do the  next step
3. Reset the iPod -> Press Menu and Center button simultaneously for about 10 secs or till the Apple Logo comes ON
4. Then release the buttons
5. Select your preferred language.

Here is the Apple support Article on the 5Rs

http://www.apple.com/support/ipod/five_rs/classic/

If it doesn't work, look into the earphone jack, and see if there is any lint or dirt in it, you can try to push in a earphone jack into the hole, to clear it.

Good Luck!