Got really bad siactica!!

Went to the doctors recently as everyone said im suffering with siactica. She confirmed that was what i have been suffering with and will may get worst as i get more into my pregnancy. Im im so much pain and i know i can take co-codamol until 28 weeks pregnant. I dont want to take any pain killers as i want to keep my body as good as i can. Has anyone suffered with this? And do they have any suggestions??  Im just over 6 months gone