One of my doctors has suggested Periodic Paralysis as a possible diagnosis for my 8 years of conscious collapses (with gradual recovery from minutes of complete paralysis leading to hours of difficulty walking) and recent several months of near constant (but fluctuating) muscle weakness.
When I read up on it, I learned that one type of it (Hyperkalemic) has "Myotonia" as a possible symptom, which most resources define as muscles "stiffness", which seem ambiguous to me.
Sometimes when I am weak, I am just outright limp and my muscles don't respond. Other times (possibly myotonia?), it feels like they are contracting and actively resisting my efforts to move them. If I'm crawling on my hands and knees, often the arm currently supporting my weight will just freeze, and I will have to shift my weight entirely to relax the arm at all.
Even weirder, sometimes when I am walking I will develop what I call "gait problems". My knees will lock, my entire legs will move as a unit, making me waddle at the hip. My back will arch, and my neck will be pulled to one side or the other. All my muscles feel pulled in conflicting directions. I feel like a zombie! This gets worse as I continue to walk, and I will feel pain or weakness along with it.
Does this sound like myotonia, or is it just a weird form of weakness (or something else?)