A CT Scan or MRI with contrast may show the location of the impingement but an EMG (nerve conduction test) will tell them how bad the impingement is, and if intervention (medication, physical therapy, surgery or nothing) is warranted.
Whatever you do from this point, I'd recommend against sitting. Laying down, an ice pack across your lower back for 20 minutes every hour and some anti-inflammatories (ibuprofen or aleve or advil) along with some tylenol for the pain may help in the interim.
Note: You CAN take Tylenol with an anti-inflammatory - they're different medications that can be taken together. You should NOT take ibuprofen, Aleve or Advil together and under no circumstances should you drink alcohol while taking Tylenol and an inflammatory medication together.
I hate to say it, but I've been where you are. Take due care of yourself and get to an orthopaedic hospital if one's available -- that's your best course of action.
Best advice yet.
I’m on oxycodone and flexeril for my ongoing back issues and just took an ibuprofen (600mg) for the inflamation. I still haven’t heard back from my doctor, and I felt another pop earlier. My pain is bad at the indent at the base of the spine and it radiates up to the middle of my back, feels HOT and dull, like a fist is being shoved though me. The legs are still not doing anything, though I can still move the big toe on the right foot. I can FEEL the legs, I just can’t move them. I have borrowed my daughter’s wheelchair and crutches, though she has been on again/off again needing them herself. I have an appointment with a surgeon for a consult a week from Monday. It was suppose to be this Monday, but they scheduled it for the wrong location and I had to cancel since I didn’t have 3 days notice to give to transport of the location change. (my van is GONE...engine destroyed, given away for scrap). Besides, can’t drive if the legs don’t work :(
“You should NOT take ibuprofen, Aleve or Advil together”
fyi, Advil is a brand of ibuprofen.