Sorry to hear you're in so much pain.
I've had tremendous benefit from chiropractors and osteopaths with chronic low back pain - I often get referred pain in my groin/upper leg too. My last chiropractor got me out of daily pain after about 3 months of treatment, but sadly he left and my back deteriorated againI am now seeing a lovely osteopath who has already helped enormously - so for once I am not wincing as I write this.