Gary sounds like you guys have been put through the mill.
i have suffered from sciatica twice, both times were not pleasant and lasted for approx 6 - 12 months.
In my case, the first time, bending constantly with bad posture at work, pinched the sciatic nerve, causing it to swell and become inflamed
making it even more prone to further pinching.
Once I identified how it was happening, I modified how I did the job, stopped the constant bending, and within 6 weeks the pain was gone.
The second time (last year) I was on holiday and the bed was very soft, giving me a bad back. Because of that I walked and bent (again) in an unnatural manner.
Pinched the sciatic nerve again and bam (pain was back). Took nearly 6 months to clear that one up.
It's all about how you bend at the hips. try to limit that and the swollen sciatic nerve has the chance to heal.
I hope your wife gets better soon.
and you need to try not to be burning the candle at both ends too.
Good luck.