Rather severe ipod problem

Hi, hopefully someone here can help me, as i've been systematically trying every other instruction and suggestion on the support pages of this site, all to no avail.

I have a 20gb click-wheel iPod. Basically whenever I try to upload songs from my library, it just freezes halfway through, and my whole iPod just freezes up too - the "Do Not Disconnect" sign just stays on the screen, not flashing as it usually does but just frozen. Added to this, my iPod makes quite worrying whirring and beeping sounds when this happens. I press the eject iPod button but nothing happens, so I just have to unplug it and reset it for it to work again. I can't upload any songs at all now without the whole thing just freezing up on me. I'm pretty sure i've tried everything this website suggests, including restoring it, and I have all the lastest software updates, but still the problem remains. I can still use my iPod to listen to the songs I have on there fine, but whenever I plug it in and try to upload any new stuff from my library, it just crashes again. If anybody has any bright ideas of what to do, i'd be incredibly grateful for your advice. It's out of warranty now and I can't afford to have it serviced.

Many thanks,

Alex