Here is what I would do from a shiatsu perspective.
Without getting too clinical, a lot of sciatic pain stems from having a tight butt.
More specifically, a tight piriformis.
Unless you've been diagnosed with something more serious like spinal stenosis or a herniated disc, it is relatively easy to manage.
http://www.chiro.cc/health_page.php?page=piriformis_syndrome
That is a picture of what is going on in your backside.
When the piriformis gets tight, it pinches the sciatic nerve and causes what you may be experiencing.
So what do you do to help with the pain?
If you have a partner that doesnt mind touching your butt in a clinical sort of way, you can start by doing this.
On the side that is bothering you, have them use their thumbs to press deep and gently on the 4 points going across the iliac crest, medial to lateral (spine towards the leg), do this 3 or 4 times.
Then have them massage the namikoshi point 3-4 times for about 5 seconds.
Move onto the the points running along the sacrum, same thing, 3-4 sets, about 3 seconds for each application of pressure.
Move onto the points that run diagonally from the sacrum to the greater trochanter.......this series of points lies across the piriformis, tell them to pay particular attention to it.
Finish it off by having them place their palm flat against your buttock, press down firmly, and move it in a clockwise motion with deep pressure.
do this a 3-4 times a week when it is really bugging you and you should notice a change.
If par chance, you do not have anyone to help you.......I like the old golfball routine.
Place the golfball on the floor, in position by the sacrum near the origin of the piriformis.....slowly roll over onto it, so it applies pressure. Move it along the 4 points in the same fashion to massage the muscle gently.
