I've had a lot of sciatic pain in the past 5+yrs (after incorrectly doing a yoga stretch whilst very overweight....of all things!!) and what I've found that has helped the most is strengthening my core and pelvic muscles which were totally non-existent. Admittedly I've had the help of a personal trainer though. Do you belong to a gym? Perhaps ask for some stretching / movement recommendations.

Initially I found a chiro could get rid of it almost straight away through adjustment (but would always eventually have to go back) but I don't recommend a chiro anymore after a bad adjustment a chiro did to my neck. My GP told me flat out not to even consider a chiro, but everyone is different. I've also been seeing a physio and they can recommend lots of stretches, as well as working on muscle areas through massage for you.

The most consistent advice I was given by any professional was to keep active and don't cross your legs when sitting etc.