Lead Legs Syndrome

Less than three weeks to my 30 mile ultra at Clinton Lake and I am really struggling.  I felt great all winter and I have the worn out shoes to prove it.  Now for some reason,  I cant seem to get my legs moving, like they are wanting to go in different directions.  I am starting to get worried.  Even took a few days off to rest a little and it got worse.  Hope I can run out of it.