I agree with *appalled*. I think that it’s the best word for the context you’ve given. 

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[Here’s][1] an interesting diagram for you! It displays several versions of emotions. Maybe you will find it useful. 


  [1]: http://lifehacker.com/find-the-perfect-word-for-your-feelings-with-this-vocab-1653013241

Edit: Under the category 'surprise,' the wheel lists startled, confused, amazed, excited, shocked, dismayed, disillusioned, perplexed, astonished, awe, eager, and energetic. 

I apologize for not summarizing the link originally.