Sudden attacks of back pain without major trauma are usually due to the spinal discs which can herniate or tear. Sometimes the disc injury can irritate the nearby nerve and that sends pain down the leg. When I see someone who has had back pain for a year and has nerve pain, I order an MRI because that imaging study allows me to see the discs and nerves. Plain X-rays are great for ruling out major bone problems, but they don't tell the whole story. With a more accurate diagnosis, solutions become possible. Find a medical doctor who specializes in back injuries.   You are right to hold off on having a baby until your back feels better. Pregnancy can make back pain much worse and that is before you have to run around chasing a little one. Dr. Christina Lasich, MD