I think you should make it clear to your friends that you not staying over and being more comfortable with your routine has nothing to do with them, and more to do with the way you are. It still seems like they were very understanding, though, even if they were a little disappointed that you didn't end up staying.
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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.