I have a tight pulling pain in the lower back and a cramp pain in my buttock running down the back of the leg?

WeaslesRipMyFlesh!!! Is there a German Shepard clamped onto your butt?Or it just feels like that?Or maybe it's like someone stuck you in the lower butt with a hot poker with molten lead running down the back of your leg?Or maybe like a weasel crawled into your but and is gnawing its way out by way of your leg?Or...well,you get the picture-- i mean I get the picture. Sounds like sciatica and you should see your doctor.