Does Delayed Back Surgery Cause Severe Sciatica?

Good afternoon Could you provide me with an estimated wait time for a neursurgen to perform back surgery that has caused severe siatica ? I have been waiting now for 7 months, and just got word from the booking lady at the surgeon s office in Edmonton that they are so backed up that it will be another 8-10 months before they get to me! Im searching for a possible sooner date if I travel to calgary ?