Sounds like the sensations I had when the nerves were mending after my bypass surgery. Such things are hard to explain, mine felt like cold water running down the inside of my chest for about 2 weeks. Are you on diuretics to reduce fluid retention in the lower extremeties?
Your question is very non-specific. Many things might cause your symptoms, such as nerve damage. Why not keep a log of when these things happen (your position, meds taken, etc.) so that your doctor can help you get to the bottom of this?