I also injured my siatic nerve while pregnant, and let me tell you, know one but someone that has also injured their siatic can understand what excrutiating, debilitating pain it causes. It infilitrates every part of your life: you cannot sit, stand, lay, move, or walk without pain. It is difficult to take care of oneself with this type of injury, much less a newborn and/or other children as well.
I was 6 months pregnant when my siatica started acting up: I was the manager and head teacher of a private, special education preschool that required me to do alot of heavy lifiting. I had initially thought that I had just badly injured my back, and took a few days off work. After a week, the situation had only gotten worse, and my OB referred me to a neurologist - I was then diagnosed with a badly pinched siatic nerve. I attended prenatal yoga classes: they didnt help. I saw a massage therapist, a chiropractor, a physical therapist - anything for a little bit of relief. Because I was currently pregnant, I could NOT take anything but simple over the counter tylenol - and that did nothing to help my pain. Every day was a struggle to make it to work, to try to function - and as my pregnancy went on, the pain got worse. Not only did my back hurt, but now all the muscles on my left side, including leg, foot, hip, shoulder, arm all hurt because of my body trying to compensate for my pain. I wasnt sleeping, because it was so uncomfortable to do so.
Finally, as a last ditch effort, my doctor suggested that I visit an acupuncturist. Now, I was very skeptical at first: I have several degrees, and work in an environment where modern medicine and treatment holds paramount, always. But, when you are in severe pain, you will try anything. And, by God, the acupunture worked!
It by no means provided instant or complete relief, but over time, my pain dimished enough for me to feel half good again, and I was able to return to work and function until the end of my pregnancy. Let me tell you, I have never been so happy to have that epidural needle put into my spine when I went into labor. LOL.
I continued to have some pain after the baby was born: I breastfed, and so could still not take any stronger pain medication, but the actupuncture really helped after I didn't have the baby weight pressing on my siatic nerve. It lasted for several months after my daughter was born, and the acupuntcture really helped to help dimish the pain quickly, without medication.
I would suggest looking into actupuncture in your area: my acupuncturist actually worked in tandem with my OB office and was a subscriber to my insurance - call your insurance company and see if they have any acupunturists on their list. Its such a widely used service now that most large insurance carriers will pay for most of it! Even if your insurance will not pay, I suggest you go anyway - anything for relief.
My siatica still acts up, and is much more "touchy" than it was before the pregnancy. But it is NOTHING in comparison to what it was before. I have only one child, and plan on having more in the future: now I know that I DO have pain relief options if my siatica acts up again.
I hope this helps. I urge you to look into the acuptuncture, and at least give it a try. If it doesnt help you, at least you know you gave it a shot. It doesnt hurt one single bit: there is no blood, no discomofort, and I found the break relaxing in itself.