Why is my website so volatile on google?

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Hello. Thanks in advance for your responses. My website is http://www.resolvedhypnotherapy.co.uk. I released it back in October. It is well optimised in terms of key words, is regularly updated with new content and I'm building links. Now, if it were static I could understand that things take a long time to progress. I've read a lot of SEO stuff and I hear it's more a marathon than a race. What I don't understand is why it has plummeted ten pages in the previous 24 hours. It's not penalised by google. I do nothing of a "black hat" nature. No weak sites have linked to mine. All I have done is add content of the normal nature.

Is this normal in a young site? Should I be worried? Until yesterday it was making slow progress through the ranks. Now it seems to be free-falling...

Thanks, again, for any suggestions.

Paul