There is no way to know the true health of your discs without an MRI study. Usually this is not neccessary, as most acute episodes of back pain self-resolve (often with the use of anti-inflammatory medication) in 72-96 hours. Occasionally, the use of steroids, such as prednisone, can be used to calm down an inflammed nerve. When the pain radiates into the lower extremity, it is often a symptom of nerve root irritation, and this is best treated with oral steroids.
If you heard a 'crack'' when this happened, it may be due to a dysfunctional SI joint, in which Osteopathic or Chiropractic adjustmen may be beneficial. I would wait to calm it down before I would attempt either.
Once it heals up, and the acute episode is over, there is a great book entitled 'Back Together' from Running Press- great book, effective tools for preventing back pain. The author is intelligent, handsome, personable, and likes watches alot. Ahem....
I hope you feel better fast, and all my best.
-O