It is awful but if just comes with pregnancy. Try rubbing a tennis ball on it or a cold compress. Or maybe a shower that has a massage setting. Or have someone massage your back with their thumbs like deep tissue massage
I'll be 32 weeks tomorrow. My cousin had sciatica during both her pregnancies it sounds awful it used to go right from her back to her feet
How far along are you? I was getting sciatic nerve pain when I was about 23w until the end with my first. It is starting again with my second now