Sciatica is a frustrating affliction. I've experienced it on and off for years. It usually would begin for me after a weekend of yard work with lots of bending and lifting, but would go away within 10 days to 2 weeks. However, my most recent episode began Labor Day and hung around until mid December, or about 12 weeks. During that 12 week period I had my annual physical and was told by the doctor to return for instruction on core exercises once the pain eased.
At age 61 I expect some aches and pains, but sciatic pain can be excruciating and over-the-counter pain remedies hardly touch it. And yes, when the nerve is badly inflamed the tingling can go all the way down to the toes and sole of the foot.
As with most ailments, I've found that stress can aggravate the condition. Once my stress eased in mid-December, so did the sciatica. When stress recurred recently, so did the sciatica. Never underestimate the ability of the brain to mess with you.