***MODS, can you please delete the other thread like this in Back Disorders please??? Thanks!***

Let me give you a little bit of my history: Almost 2 years ago I was injured on
a roller coaster (I came out of the seat, landed wrong, and got severe
whiplash). Ever since then I've had neck and back problems -- I'm under 16. I've tried 3 courses of physical therapy (which only aggravated the problem),
massage, chiropractic care, etc., etc. Three of my doctors have told me that I have "the tightest traps" they've ever felt, so I am now scheduled for Botox
injections in my neck, trapezial muscles, and down my C and T spine. After
seeing a neurologist, I was finally diagnosed with cervical plexus and brachial
plexus neuralgia. I guess this is because I also have numbess and pain that
radiates down my arms (???).
I've been unable to really do anything phyically, and the only time I'm not in
excruciating pain (still in SOME pain though) is when I'm laying flat on my back -- no walking, sitting, standing, etc. I've been out of school for almost 6 months now as well.

Now for my question: For the last three days I've been having pain from the
lower lumbar region of my spine (I'd guess L4-L5), down my right leg. I also
have numbness, and my right foot feels very, very cold compared to my left one. The pain is mostly down the BACK on my leg (from the L4 area to the back of my knee), but there's no pain in my calf. The pain in my thigh almost feels like when you hit your elbow (that weird, almost "stinging" sensation).
This has gotten worse over the past few days, and today, I can barely walk at all. Depending on the position I lay it, I can temorarily make it go away, but especially when I walk, sit straight up, or lean forward, it gets much worse and I almost lose all sensation on my foot. Could this be sciatica? Or an extension of neuralgia? I know that there's not much that you can do for nerve pain (I've tried everything, but no medication helped so I just deal with it on my own), and I've had numerous MRIs and x-rays which show nothing but mild scoliosis and a reversal of the natural curvature in my C-spine, so I wouldn't really want to go back into the neurologist if there's nothing they can do anyway.

Also, my right hand is completely numb and freezing cold (while my left one is normal feeling/normal temperature). Could that be related to the leg thing going on, or do you think it's probably just the existing neuralgia coincidentally being on the same side and the leg pain?

Thanks so much if you can help!!!