mmc suddenly not showing in my phone?

i have a nokia 7610 with a 64mb mmc, i`ve had the phone and mmc for 4-5yrs, working fine, then today all of a sudden my phone froze, i waited 5mins and then i switched the phone off. when i switched it back on, it sort of went crazy, applications were in different places and then they started to dissapear 1 by 1, then the phone said system error and then the memory card just died, now the phone is saying memory card not inserted.... would really appreciate any kind of help or advise on rectifing this problem, thanks so much x.