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You should definitely call the police department and file an incident report. Depending on your age this could result in very serious charges for the photographer / blackmailer. You may also want to have a civil lawyer send a demand letter outlining legal action and demanding the photos be deleted and not published.
The above does nto constitute specific legal advice. It is always advisable to seek the advice of an experienced lawyer who can discuss all of the facts and circumstances of your individual case with you.
When you say "without your permission" do you mean that you were asleep/unconscious or that you were drunk and now regret it? It's possible that both the photography and republishing to Instagram would be actionable, depending on your answer. Either way, though, I think the republishing would be actionable.
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