Onebear,
It is possible that "this test" which i suspect is called and EMG/nerve conduction test, may be useful, BUT and this is a huge BUT
I'm assuming when you say "my doctor" you are speaking about your primary doctor and not a spine specialist.
If my assumption is correct, your doctor is not qualified to decide what tests should or should not be done to diagnose you.
Also x-rays are really a poor choice to determine what is going on in your spine. You need an MRI.
Before getting an MRI you need a full evaluation with a spine specialist, either an orthopedic surgeon that specializes in spines, or a neurosurgeon that specializes in spines only.
The spine specialist is the doctor with the knowledge of what tests you should have done, what type of MRI you should have and what location, Not a general doctor with no expertise in spine issues and just reading a piece of paper that has the radiology reading of your MRI.
There is a slim chance that your symptoms will stop again, but at the same time if you have nerves being compressed by your discs, you will get worse not better without any kind of treatment.
What type of treatment you require depends on what your MRI shows and how it matches your symptoms.
The general rule of thumb though, is to try conservative measures to treat disc problems first.
Those include physical therapy to try and have the discs heal on their own, if that doesn't work then epidural injections can be tried and if that doesn't work, then there is the possibility of surgery.
It sounds like your symptoms have progressed and are getting worse since you first began having symptoms for a short period of time.
You need to see a spine specialist as soon as possible for evaluation and diagnosis. so that a treatment plan can start to relieve you of your pain.
Good luck
Fran