I have had synesthesia since I was a kid, though it was much stronger and more distracting when I was younger. My mom has it too, though she is NT.
The ones I've recognized are all colour based - number/colour, person I know/colour, month/colour, and day of the week/colour. If I am on any kind of sensory-altering drug, I can get other combinations - sound/taste, sound/colour, and shape/colour/taste are a few I've noticed.
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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.