With back injuries there is a wide range in severity and a correspondingly sizable array of different treatments. Ideally, as much information is gather about
the injury as possible and the proper course of treatment (from short-term pain relief to surgery) is assessed, usually starting more conservatively to avoid unnecessarily invasive (and expensive) treatments or procedures.
It seems like your GP approached the problem most conservatively, trying to treat your pain without directly addressing the physical trauma. Most disc displacement problems heal on their own within 6-12 weeks, so a more aggressive approach would most likely have not been appropriate (though I don't know why you had to go through three doctors before imaging studies were ordered).
Next you went to a chiropractor and didn't have much luck. I'll admit that I'm somewhat prejudiced against chiropractics in general--a large portion of practitioners rely on rather blunt techniques derived from pseudoscientific principles (not everything can be fixed by spinal manipulation!)--but I do believe that a good chiropractor (particularly with more modern training) can be very helpful. In your case, you report that he failed to resolve the issue and frequently made the pain worse. Again I wonder why you had not yet had an MRI study ordered. Trying to fix your back without actually knowing what was wrong with it, the chiropractor was probably as likely to cause a problem as to fix one.
But the important part is that you did find out that the likely culprit is a disc protrusion. Unfortunately the (cortisone?) injections didn't help but seeing a PT who does PM is a good step. I'm unclear as to whether you have tried PT for 3 months or 3 weeks. If it has been as long as three months and you haven't found relief, try talking to your therapist about
your lack of progress and ask what sort of timetable they're looking at. PTs are trained to be very goal-oriented so this sort of discussion will hopefully be fruitful. If you and/or your PT don't feel like you're making progress you discuss a referral to an orthopedic specialist (given the nature of their work many PTs have relationships with good orthopedists).
An orthopedist will have the best resources at his or her disposal to find a solution to your problem. You might be advised to have corrective surgery. While it hopefully won't come to that, if conservative treatments have failed it may end up being a smart choice (especially considering how much you very understandably want it to just go away).
I wish you the best of luck. Having a painful back injury is a terrible thing but knowing the specific source of your headaches gives you greatly increased odds of finding a solution. Keep us posted on your progress.
DX: NDPH, Recovered(?) CRPS
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rarely: Migranal, Thorazine, DHE IM, Droperidol IM, Reglan, Provigil, triptans (Imitrex, Maxalt, Relpax, Zomig, Axert, Amerge)I can be contacted personally via email at korbnep:email@example.com.