Google services not working.

Okay, so I rooted my S2 and updated it to 4.4.3. When I switched it on, everything was working fine but my Play Store said "Authentication failed!.. Blah... Blah... Blah... Retry" but when I pressed retry button I wasn't able to reenter my already entered ID. Then I deleted all Google services and apps. (I thought they would roll back to their original state and then I would update) but they permanently got deleted. Then I tried to download Play Store's APK. Now it's closing instantly. I am also not able to add any Google account. When I try to create an account by using YouTube app, it instantly closes(not the app but account creation form). What to do now? Any help would be appreciated.

4.4.3 on an S2? Is it a custom ROM?

If so, did you download and install GAPPS?

My S2 stops at 4.3. However, reflashing Gapps in recovery should bring everything back.

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