You might also feel that you need to respond in a certain way, say the correct words or to give all the answers. 
We would like to reassure you that it is totally ok to not know what to do or say. What it is important is that the survivor knows that you are there, that you believe him/her and that the abuse was not his/her fault.

Rarely do we take the time to inventory what leads to our anxiety experience, so it is a good idea to first make a list of what seems to lead to the anxiousness.

Abuse is never the fault of the victim, no matter the circumstances. 
It is also not your fault. 
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If you are dealing with anxiety you can read this:
https://www.kcrasac.co.uk/self_help/anxiety-and-panic-attacks-self-help-guide/
https://www.calmclinic.com/anxiety-guide