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I had a selective nerve root block (lidocaine only) four days ago on l5/s1 to confirm the pain source of my sciatica. My pain was 100% eliminated for a couple hours, but came back to a baseline of 5 later in the day. After that, the pain became really severe and has stayed like that for the last few days. I did not expect this to happen, or I would have not had the test. I have a small l5/s1 disc bulge with pain that was a 10 all December(I could not sit, stand, or walk), then 3 epidural steroid injections, and the pain went down to a 5 and stayed that way for the past couple months. I am scheduled for a discectomy in the near future, but if just injecting the nerve root area caused so much increased pain, I am really nervous to have a surgery to decompress the s1 nerve, which could put me back in unimaginable pain. Has anyone had a bad, long-lasting flare-up from a lidocaine injection? How long?