My iphone 4s installed apps not working?

My cydia app was not opening

Is Cydia not opening or an app installed via Cydia not opening?
If it is Cydia, you need to make sure your iPhone is completely jailbroken. It is better that the jailbreaking is an untethered one. I think you may need to re-jailbreak it: http://ijailbreakguide.com/

If it is an app installed through Cydia, a good way is to re-install it and reboot your iPhone after installation.

If your having a lot of trouble on Cydia then it's better to unjailbreak it then jailbreak again.