iPod Touch 2nd Generation

Hi I have a 2nd Generation Ipod Touch and I need some serious help.

For starters i've recently updated my ipod with the newest software so I could get some applications and i've noticed that it has been freezing alot when I listen to music outloud, play games for too long and watch videos. I have reset it and restored it about 7 times now but nothing is working?

Secondly every time I connect my headphones to my ipod I cant hear the music, it's like the headphones aren't in properly but they are and i've bought a new pair but still the same thing happens and i've tried so hard to find the answers I need but they say I have to replace the audio jack and I can't afford to spend more money on fixing my ipod......

PLZ HELP ME I'M DESPERATE!!!

If you have the right answer or something please email me at fullmetal1923@hotmail.com thanks :)