Help: Electric Shock pain on teeth

[Katy]

Hi
Very suddenly just 2 days back, I've been experiencing this mild "electric shock" pain at the lower front portion of my teeth (it's hard to pin-point the exact location...) It's been there 24/7, continuous. Can anybody come up with reasons why this is happening? And the solutions to this problem. Thanks!
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FYI I brush my teeth very diligently every morning and night and do not have any tooth decay. And I've been wearing my retainers for about a year after taking off my braces.I am very concerned about whether it's happening because of enamel erosion/nerve issues/gum problems...

 

[drmins]

This pic alone can not help in diagnosing the situation.However,please do let me know if,
1) Have you got any sensitivity upon cold or sweet food?
2) Does this "shock" aggreviate on blowing air? Or upon cold water gargling?