So sorry to hear that your poor girl has hurt herself again,really hope she's ok.
Will keep everything crossed that the meds work,and she can relax a bit more when you are out.
Can see the logic of a cage,but agree with you that it might not be practical and could actually make her panic more if she has an episode and is in a very confined space.
Don't have many suggestions I'm afraid,although I was wondering if there is such a thing as a mild sedative or calmer of some sort that she could have when you go out,just to take the edge off?? Although if you both work and are out every day I guess that woouldn't really be an option.
I think the camera idea is a good one,at least could see of there is a particular thing triggering it (might be a noise or event that's suddenly started occuring outside maybe??),hope you work something out anyway,thinking of you and OH and Tanis.