Wendy I sympathise for you. If you have any compression stockings/tights do wear them they really will help you. I speak from personal experience and as the others say your dr will probably give you antibiotics for it.
Poor you, but you must see uour doctor again. Try not to scratch it, you'll make it worse, There's not much you can do tonight - try putting cold compresses on it - soak a towel with cold water and hold iot against the vein