I don't know if it would hurt your pride to admit that you found a link at someone else's site, but I can see that you don't use very many "Found at" links on your blog.
I only ask that you at least add my site to the blogroll/link list on your blog if you take content/pictures/links that you first encountered here if you find you are unable to make a direct attribution.
(If you are in my links list over on the right, this does not apply to you.)
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.