Was it suitable to measure your bp in nervous or anxious and get a correct reading?

Correct?: If you mean by "correct" - representative, then no, hopefully not. If the device is an accurate one and you used it and read it right, then yes, it was correct for that point in time. It showed you what your body deals with under the strain of anxiety. Good reason to learn ways to lower stress and anxiety, wouldn't you say? Take a BP reading when you feel calm to see the range of difference.