Mri showed annular fissure/disc herniation at l5 s1, w/abutment of s1 nerve root but no canal stenosis. i have si joint stiffness and pain daily, but no "nerve pain" type sensation and no weakness/numbness. what's the treatment and is this dangerous?

Sacroiliitis is likely the cause of your pain not herniated disc with radiculopathy. This condition is not dangerous. You can read more from this link: https://www.mayoclinic.org/diseases-conditions/sacroiliitis/symptoms-causes/syc-20350747. If possible, you should be referred to see a rheumatologist.

Would agree with Dr Le that your pain generator is most likely the sacroiliac joints. Evaluation of causation, such as ankylosing spondylitis appears appropriate. A sacroiliac belt will relieve symptoms when worn, but will not be curative. Osteopathic manipulation may be helpful. Exercises can be learned from a physical therapist.