Take the physio, and also ask about things like sitting positions and stuff... I find mine is worse with a day on the office chair, and better if I do a few hours on the fit ball...

Get the physio to also give you some leg stretches, as I know mine is caused in part by my really tight leg muscles, and if I give a good stretch at night it can help, but it has to be the right stretch IYKWIM...

Hope you get some relief, as sciatic pain is not fun and you dont want it to turn into anything worse... xo