My Leg Is Swollen From The Knee To My Toes

my leg is swollen from the knee to my toes and it is hard all along the calf. I had an ultrasound and they said it was ok. I am having an interstim put in on Tues and am concerned this may be a problem although the nurse that told me the doc said my ultrasound was ok and it would be ok to have the surgery. I guess I will have the surgery which I have been waiting for paperwork to get done because I am a disabled veteran using the choice program. Do you fell I should be okay with this procedure being done since it is a minimal invasive procedure?