how can i fix my iPod touch 4 8GB....it keeps on saying There is not enough free space to continue taking photos. Make room by deleting existing videos or photos...

but i have already deleted so many files from my camera roll and it doesn't have any videos and it keeps on saying that...
i have jailbroken it wit about 600 apps installed but it was working well untill i installed installous ang some other tweaks from cydia.
i have already removed the tweaks and apps but still facing the problem.

BTW i dont want to sync it with iTunes coz i dont have any acces to my previos account and it will delete my apps. i dont want to remove my apps.
i have already deleted all pics but still it says the damn message and prevent me from taking photos.
i used some apps like iWipe, iWipe cache, Clean up Crap(CuC). but still no use.