How to get cydia back on my iphone after it disappeared after I deleted a theme?

I've had a jailbroken iphone 5 for a month running on 6.1.2 and i was trying out themes. I deleted one i did not like and re sprung the device. Cydia and 2 other tweaks I had are gone. Nothing comes up under the spotlight search and I do not have Ifile or SBSetting installed. How can I get cydia back?

I would restore it and make it ios 6.1.3.
Then downgrade it using sn0wbreeze and tinyumbrella BACK to ios 6.1.2 or any other version.
Jailbreak again using evasi0n
here's a link:

http://www.evasionjailbreak.org/downgrade-ios-6-1-3-to-ios-6-1-2-using-sn0wbreeze-snowbreeze/

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