Sciatica from Deadlifts (No Herniated Discs Here XD)

Hello, for about two years I've been suffering from some sort of sciatica all down my right side and occasionally left. This pain is worsened quite a lot when sitting for long periods of time. I've tried stretching pretty much everything in that area including the muscles and the sciatic nerve itself.

This originally happened as a result of sumo dead-lifting. I've continued to dead-lift instead conventional and it has not worsened my sciatica at all.

I really doubt that muscle weakness could be the cause of this.

I've been to physical therapy, the chiropractor, I've even asked doctors but none of their suggestions help.  

Wasn't sure if I should post this in brain and nerve or muscle and joints either seems like it would work.

I hope the answers will help other people going through this annoying s**t. I'll be happy to compensate if someone helps.