foot drop and swelling

after a Laminectomy 2 years ago they did an MRI the next day and said "one of the screws was outside the parameters"  no-one has been able to define that diagnosis.Then I started expieriencing weakness in my right foot, as if I couldnt use my toes, it has gotten worse over the last few months with swelling in that foot up to the ankle.  I cant raise my toes or hold on a shoe like a sandle. It is turning a reddish color. I've had a "Doppler test" for blockages but it was negative.  I am afraid of having another surgery, the last one was so painfull