Severe hip pain/ Sciatica

Mr

Since about 12 weeks, I’ve had sciatica. I had it with my first, but not until the end and by 8 months I could barely walk. Now at 18 weeks, I feel like I’m already at that point some nights. It’s only in my left hip, but it gets to the point where I can’t put any weight on it. Idk what to do..I’m a teacher so I’m on my feet for 9 hours but I’m trying to make an effort to sit a little more, if and when I can. Besides a chiropractor or massage, what has helped you ladies??