Fluctuating pressure pain sensitivity, including time to redness; worsens in times of PEM

When I overdo it, how long I can remain in one position (either sitting or lying) drops because the skin becomes sore from the pressure.

An interesting aspect of this is, unlike many symptoms, it’s visible: my skin reddens so an interested scientist or clinician could measure times and notice the fluctuations.

Some from the biopsychosocial school might try to dismiss the symptom/sign as deconditioning but that doesn’t explain the fluctuations.
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Some research findings that may tie in with this

“Pressure pain threshold decreased in ME/CFS patients with or without fibromyalgia after head-up tilt test (HUT), but did not change post-HUT in healthy controls”
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⁠https://www.clinexprheumatol.org/abstract.asp?a=15665⁠
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“Pain thresholds, measured in the skin web between thumb and index finger, increased in control subjects with exercise while it decreased in the CFS subjects”
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⁠https://pubmed.ncbi.nlm.nih.gov/15157711/⁠