My impression, is that you may have a "failed back"... So further testing with imaging is really the best thing to do at this time.

For pain, there are Lidoderm patches, which could be used on the area affected (your spine), to block the pain signals for you. These however, are expensive, if you don't have insurance. Ice packs twice a day for 20 minutes may help. Also the compounded pain transdermal RX products from compounding pharmacies with the various drugs in them, may be an option. But those are expensive also.
I would avoid heating pads, or hot tubs as heat will stimulate nerves. Also if ice works, don't overdo that... you don't want to compromise your circulation. Over time ice packs will settle down nerve firing, so be patient with twice a day use.

Having loss of muscle strength in the IMO is a serious thing. You should focus on that with your doctor. Perhaps there are isometric exercises you could do in bed, to keep your muscles working?
Physical therapists teach these, to people with injuries or who are post surgical to keep muscles from atrophying.

There are non drug ways to control pain. Learning meditation, and/or autohypnosis may help you not to focus on the pain.
This link has some interesting tasks, to help retrain your perception of pain signals:
http://www.openfocustraining.co.uk/exercise.html

I learned many years ago to alter my perceptions, which at the time was to facilitate my art work. But in reality this type of activity helped me to avoid focus on my painful feet which at the time were symptoms of an undiagnosed thyroid problem. I've used breathing techniques and mental exercises ever since and have found this to be very very useful for my chronic pain issues.

You might want to also post at our spinal forum... some of them have failed spinal surgeries and may have some advice for you as well:
http://neurotalk.psychcentral.com/forum22.html