If your clicks were generated "illegally" then you need to worry but if you received them from legit sources, then enjoy the earnings.
WOW Adsense has all pretty paranoid, it's scary really. They really do scare the crap out of me, I follow the rules, I do everything right and I stress everytime I make some money that they will keep it. As I say this I set up another site with thier ads on it, is it a success, will it get me banned, WHO KNOWS. I often wonder is it worth being stressed? I'm not sure yet so I just keep building the income waiting and Praying it all works out. after all my adwords was banned for a campaign I ran 31 months previously for 1 week. Just after I joined actually. ANYTHING IS POSSIBLE!! Good luck. ODA
Did you use any fake method such as blackhat, clicking your own ads? If you do so and google get that then your ID can be banned. If you did not follow any unfair means then its ok. There will not be any problem. Thanks
Don't worry if it is just a one time thing. Try to learn what's the cause of it, is that because of click bombs or increase of visitors to your site?
You will notice surges in traffic due to news and other media events. Google sees the trends and they will understand the logical spike in traffic due to it. Don't worry about it.
Email adsense support won't work, before receiving Google's reply, OP's account might have been banned. About a week ago I asked a question about why "Site Diagnotics" in Adsense CPanel showed my website homepage has been blocked with "Not Found" reason, they give nothing by now.
Why would they flag you? I have had many a day with a CTR in that region. Some people I know have CTRs much higher than that.