On the odd occasion that I've suffered with sciatica that I struggled to tough it out with a visit to my GP was always granted. On all but one visit painkillers were prescribed and they were what I would describe as the size of horse tablets. Quite large they were and I can't remember the name of them atm and don't know if they are only available on prescription or not. On the one exceptional occasion I was referred to hospital for an X-ray. Not sure about Scotland or your area but I think in England in some areas a hospital transport service is provided for non-emergency cases that meet the requirement for it and a mobility problem is but one of the qualifiers for it.
Click
Given your ongoing post-fall problems I would be inclined to press for an X-ray, preferably via a GP referral or if necessary directly via your local A&E.