For the past two days whenever I lay down to go to bed my feet start burning, it's not the top of my feet it's the bottom of my toes and the pads of my feet, it kind of feels like someone stabbing my feet with fire hot pins/needles. It first happened on November 26, but after awhile it stops and I can fall asleep, and it doesn't happen when I'm awake and sitting up. I take medicine for my hyperthyroidism, I take birth control and I take iron supplements too. I've been taking the thyroid medicine and birth control medicine for over a year now and I've been taking the iron supplements for a little over two months now. I have to take these medicines once a day every day.