I've got everything crossed for you Becky.
I just wanted to post a quick update, as if all goes to plan, Becky may be back on her feet in a month or so. We're still not 100% sure of the problem, but it looks like Becky has had a spinal fluid leak for a long time - which would explain why she can't sit or stand. This is alongside, but likely caused by the back issues.
She is getting a "blood patch" to try and seal the leak at the end of the month, and if it works it will be life changing .