Well hopefully someone else with more knowledge can comment, but it is my understanding that anxiety certainly can cause problems with testing. But a gap like that can also be indicative of NVLD, or possibly other problems. And I seem to recall there is also quite a strong association between NVLD and anxiety? Hopefully someone else can suggest some good questions for you to ask your tester, but perhaps it might also be worthwhile considering re-testing with a 2E specialist?