How big have your courses been? Depending on how big they are, there's a chance this person might not remember you. If they're small enough for them to recognize you, you can introduce yourself and say that you've seen them around in some of your classes. Ask how they found the classes and talk about the teachers, marks you got, tests, etc, since that's what both of you have in common.
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Given a “tentative” diagnosis as a child as I needed services at school for what was later correctly discovered to be a major anxiety disorder.
This misdiagnosis caused me significant stress, which lessened upon finding out the truth about myself from my current and past long-term therapists - that I am an anxious and highly sensitive person but do not have an autism spectrum disorder.
My diagnoses - social anxiety disorder and obsessive-compulsive disorder.
I’m no longer involved with the ASD world.