Morning norfolkbird,
Sorry to hear about your accident......I bet the pain is unbearable at times as it's the bottom of your spine......as Ummmm says what did the hospital say?........
Healing times would obviously vary, so I would take what they prescribed you....if not working, go back to hospital or GP....get strongest pain killers you can for relief.........rest easy for at least 4 weeks...light massage may help but only lightly not too aggressive if you can get someone to do that.....if still bad go back to hospital/GP for advice/further help.
I wish you a speedy recovery, norfolkbird.... and welcome to AB btw.......:0)