The leg problem is improving slightly. I haven't taken a generic simvastatin since Saturday night; tonight, for the first time in several days, I'm not seeing a continued deterioration in mobility, nor am I experiencing the escalation in cramping and pain that has been the norm for several days.
At this point, I'm going to take "not getting worse" as an improvement. I'm curious to see if a couple of more no-simvastatin days continue the trend.
Then, of course, I have to deal with the whole cholesterol problem... but I'm going to find that much more workable if I'm actually able to walk without constant pain.