I've just had a second discectomy. Since my first (3&half years ago) I've had a feeling of instability in my spine at L5S1 where it feels like the vertebrae are moving around a lot. It happens maybe 2-3 times a month and lasts from 1-7 days. In bad times, I've had it for up to 3 months. It causes huge pain & when I walk, a hunch and an odd gait. Also herniated disc & have based sciatica when this happens. My specialist has suggested that when it happens if I can't get relief, it would help to avoid sitting or standing (ie. lying flat as soon as possible) in short term until it settles to help with pain and muscles spasming. I've been told that I'm not a candidate for fusion. Whilst lying flat may be helpful, I'm not sure how practical this is for work or when I'm not in the house and can't home quickly. What helps others with this movement in their back?