Jenni, trust me when I say I know how bad your pain is. You probably have it more often than I have or did, but when your lower back goes into a muscle spasm you experience that "Locking up" feeling where you can't move and it takes everything you've got to just sit still and breath until the pain eases up. I'm sure several other people here have been through the same. I call that "locking up" spasm my level 10 and my normal pain throughout the day is probably around a 4-5 when I'm on my pain meds and muscle relaxers. If I don't take them it would probably kick on up there to around a 7 or so, but a 10 is basically Immobile for me and I would go into tears when I experienced a back spasm.
That said, I have many family members that I would consider "addicted" to pain meds and muscle relaxers, one of which is my own sister. She mopes around like a lump on a log all day and hardly ever does anything but sleep on the couch and watch TV. She is 42 years old and lives with my parents because of her mentality and all the crap she has taken in her life due to her back pain. So when I have my own sister like that, I understand where the PM doctors are coming from when they won't prescribe on the first visit. If you keep good medical records and have that first appointment and they can see that you are really in pain, I would like to think they would try to schedule you to come back in within a day or two to get an injection, but I can understand their hesitance on writing a narcotic script right away.
When I first started having my spasms and major issues, I had already seen my family doctor, an orthopedic surgeon, done a couple weeks of PT (well tried to anyways), and none of that was working. I went into the first apt with the PM doctor wearing two back braces and on crutches because I could barely stand up and move around. He didn't write me a script the first day, instead he scheduled me to come in at 9am the next morning for the cortisone injection. I do believe he wrote me a couple of scripts that day. The very next day I was able to get up and drive to college to take my final exam which I had missed due to my back problems. This was the last final to take before I could graduate with my bachelors, so you can imagine I was happy to finally be able to get up there and get that done.
It sucks that there are "pill heads" out there in the world that get addicted to the stuff and screw it up for the rest of us who are in real pain and take only what is prescribed to us to get by and have a better day than we would without any meds, probably just moping around the house or laying in bed all day.