Serious back pain PLEEEEEASE HELP!!

Okay so I've had back issues which I was told was sciatica for 3 years every day constant pain. It's only getting worse. I am 15 weeks pregnant so not much he doctor can do but I don't really think it's sciatica anymore. I can feel the bones in my back grinding together and you can even hear it! It is soo so painful I can't even roll over.. it's been this way for so long I can't remember what it feels like to not have my back hurting. I've done everything I could possibly do to help this " Sciatic Nerve " issue but absolutely nothing works.. before I got pregnant I went to the doctor TWICE! No X-rays no MRI nothing was done because of the location they said it was sciatica. So my question is does anyone else with sciatica feel or what the ones running together? What helps the pain while pregnant? It is seriously horrible!