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Restless leg syndrome may involve any part of your leg, from your feet to your entire leg. People with restless leg syndrome describe a constant urge to move their legs due to uncomfortable sensations they experience. Some people describe "bug-crawling" sensation as well. Others describe pulling, aching or tingling sensation.
If these symptoms sound like something you have, it is more likely that the condition which you experiencing is Restless Leg Syndrome. I personally do not use Carbidopa/Levodopa for this condition. I find that other medications such as Requip, Mirapax, or Neurontin are much more useful. So since your condition has not improved at all on Carbidopa/Levodopa, I would recommend talking to your doctor to see if another medication can be prescribed.
If these symptoms that I describe are not something that you experience, I would recommend that your doctor orders other studies such as to check blood flow in your legs as well as do a nerve-conduction test.
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,