ABS issue and fog lights

So recently my ABS light has been coming on and I have been hearing a strange metallic sound coming from my wheels when driving. This noise comes and goes along with the ABS light. I would say every four or so starts and the ABS light comes on. I let it sit for a while (sometimes overnight) and the light goes away. Tried hooking a scanner up to it, but it reads all systems operable. I am not sure if it is affecting my driving or not, but it sure isn't a pleasant sound. A sort of whining or the sound of a train wheel on the metal track. I can't get a code if the light wont stay on, and we can't fix the problem if we don't know what it is. On another note, I can't figure out why my fog lights won't come on. Is there and easy way to change the bulb? Does it take a certain bulb? Which fuse might be bad?