Sounds Sciatic to me, that's the nerve that starts at your waist and runs all the way down to your toes, sounds like bed rest for a few days with heat or ice which ever makes it feel better. Also some anti~inflamatories and muscle relaxers. When you lay down place a pillow or something underneath your knees so they are slightly bent, this will take the pressure of your lower back. go see your MD and it won't take long to fix it up.
A little more on this. I tried to do the hamstring stretch where you sit on your butt with on leg out and bend towards that direction...
with my right leg I can not even get my back into a 90 degree angle before the stretching/tightness/pain is too much!!!!
how does one fix this!@