I am experiencing a sensation in my right lower leg where it will suddenly feel hot, as if I were standing near a heater. This will last about two to three minutes then return to normal only to feel warm again in ten to twenty minutes. I have never had this sensation before. I am 73 years old, female , with chronic back pain for which I receive PT occasionally. I take medication for TIA episode six yrs ago, pain medication, thyroid med for hypothyroidism and a low dose antidepressant.