Hi marcoplebs.
I think you should retake. You could have a good test as you did when you scored 780 on that practice test.
Also, you could continue to practice Verbal for a week or two using the streaks method and become even more consistent in Verbal, and you could even do streaks method practice of some weaker Quant topics and get even more Quant questions correct.
This post discusses how to use the streaks method.
The Best GMAT Practice MethodsAlso, before you retake you could do some visualization. You could visualize yourself scoring 770, then visualize yourself scoring 780, then 790, and then 800.
Also, you could visualize test day, going to the test center, and taking the test as a form of exposure therapy. Keep visualizing that experience until it no longer makes you anxious.
Finally, you could keep taking practice tests. You could retake official tests 1 and 2 and also take some third party practice tests to get to a point such that taking the GMAT feels totally natural to you.
And by the way, the fact that you already have a 730 in your pocket will help you to feel less anxious.
So, if you take those steps, and even if you don't, I think you'll score significantly higher next time.