It would be better to see a spine surgeon first before starting any kind of physical therapy.
A spine surgeon is the best to fully diagnose you spine problems and order an MRI to determine the full extent of what is going on.
The simple x-ray doesn't show the full extent of what is going on or how badly any nerves may or may not be compressed or if any of the disc material has escaped the disc.
there also could be more going on than just what the x-ray shows.
By going to a spine surgeon first for full evaluation, you will have a fully evaluation, MRI picks and a full treatment plan set up, starting with conservative treatments.
If physical therapy doesn't resolve your symptoms, then the next step would be ESI/epidural steroid injections, and if those don't help, then the potential for surgery would be the next step.
With the treatment plan in place, you can go from one step to the next for treatment.
By not going to the spine surgeon first, you have no full plan in place for treatment and if your first step fails, you have to then see the spine surgeon, get the MRI and continue from there.
As for your second question, once a disc as been "compressed" or "herniated" there will always be the potential for it to happen again.
The key is "potential". May or may not happen. You will need to be careful with your spine though now, for the rest of your life.
Good luck and keep us posted.
Fran