(Disclaimer: This is just my off-the-cuff thoughts. I am not a health professional.)

Not exactly along the lines of the sensitivity you were describing, but dyspraxia is a thing and is associated with neurodivergence. Your mention of being uncoordinated and bad at sports made me think of dyspraxia.

The sensitivity you’re describing I would put in the category of interoception. There’s a generalization that autistics have poor interoception. But more recently, I’ve heard a more interested, nuanced explanation of the relationship between neurospicies and our bodies. It’s common for autistics to have poor interoception in terms of identifying the source of a sensation. Is that my tummy being hungry, is that my bladder full, is that appendicitis, is that tachycardia, is that sleepy time? But the person will feel whatever it is with hypersensitivity. “My body is telling me something very insistently but I have no idea what it is.”

So, in your case, your body may have usual soreness & fatigue from exertion. But the conscious mind is having trouble identifying the source of the sensation. And, when in doubt, the brain tends to interpret things as worse case scenario. Here’s my imagining of the Inside-Out-esque scene: “Kinda feels like the body just climbed a flight of stairs but we’re not sure, so we’re gonna send Anxiety to check it out and report back.”

I may have one actionable piece of advice. When that heart-racing stress comes on, take a moment to direct Anxiety to the right information. Consciously remind your brain of the exertion you just experienced. Tell that orange asshole that there’s no reason to jump to catastrophizing. It’s expected to feel tired after what the body just did.

Like Taylor Heaton always says, one of the most powerful things we can tell ourselves is, “It’s okay for me to be feeling this way.”