mystery illness advice please - Page 1

My darling girl Lola is 2 half yr old gsd & about 4 weeks ago she developed a strange action on her rear left leg - when walking and trotting she would flick her foot to the side before putting it down - when it was put down it was placed slightly underneath her body. There was no pain or obvious discomfort. I rested her hoping it was a slight injury but it got no better. I took her to my vet just before Easter he could find no pain or obvious problem and gave her a course of anti inflamm tablets within a couple of days of her taking these she began to show signs of discomfort and pain. She continued the tablets - no signs of sickness or upset stomach - but off her food and very uncomfortable. Last Wednesday I took her back to my vet - he kept her in - she had a high temperature, she was now in considerable pain - from the RIGHT back leg and the tail. She had blood tests, xrays, ultra sound, given Metacam and much more - her temp was going up and down. Friday my vet decided to refer her to RVC - Queen Mother Hospital. I took her there Friday afternoon. She has had full examination there - on Monday they will begin more xrays / scans etc. However although she is probably in one of the best places in the country - they do not know what is wrong with her - they say that the various signs don't all add up. When I called them yesterday - she was on pain killers - her temp was down and she ate her food and wagged her tail at the nurse. They have now suggested it might be a neurological problem and will be injecting a dye into her when they x ray the spine area. 
As I'm sure anyone reading this will know - its the not knowing and utter helplessness that is difficult to deal with.
When I picked her up from vet and took her to hospital - she was able to walk - but very stiffly and she was quite wobbly (though poss because she was still a bit drugged up). she can get up and down from sit, lie and stand - but lying down does seem to be v painful.
Any thoughts / comments would be appreciated.
Many thanks

I'm so sorry to hear of such a serious sounding problem in a young dog.  I've had the heartache of losing one, even younger, to a neuto problem (never diagnosed, but he was paralyzed) and know just how frustrating it can be.  I have no idea what her problem could be and  I'm hoping that you get a diagnosis and, along with it, a solution.  Wishing a positive outcome and please, keep us updated.