Similar experiences are basically why I bought a TENS unit. During a bad migraine all my muscles contract uncontrollably and I wad up like a ball python, and sometimes the muscles won’t “unlock” afterwards - according to the osteos and chiros, this is because my back muscles aren’t symmetrically strong, and they’ve pulled my vertebrae out of alignment and said misalignment is pinching spinal nerves. Directly stimulating the locked muscle(s) with electricity tires them out (uses up their readily available ATP) until they can no longer sustain the contraction, and then my vertebrae can be manipulated or brought back into line with simple exercises. Without a stim unit, I might stagger around painfully for a week or two before my body naturally re-establishes its chemical, muscular and skeletal equilibriums, but a chiropractor who knows how to use a stim unit can have me back in action with only a little soreness after a day.
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