Q: My iPod has a sad face, exclamation mark and says www.apple.com/support/iPod.

The sound you describe indicates your iPod's hard drive is probably faulty.  Try putting it into Disk Mode

How to put your iPod into disk mode - Apple Support

to see if it goes passed that error screen.  if it does, connect it to your computer running iTunes, and try doing a Restore on iPod in iTunes (your iPod will be erased).

If hard drive is found to be bad, you can consider replacing hard drive with commonly available flash-based storage, in the form of compact flash card or SD card.  This web site has relevant information

https://www.iflash.xyz/