URGENT HELP NEEDED ALL HELP APPRECIATED

I am using an iPhone 5 running on iOS 7.0.4 and I jailbroke my device. One day my Cydia had disappeared! My goal is to remove my tweaks and restore my phone but I think one of the tweaks had made me unable to connect to iTunes nor my computer. Please help me and thank you in advance!!!

P.S I downloaded iFile from the internet with my phone and not sure if it will work properly and this is my last thing left in my "Jailbreak Apps"