By standing up straight you might be extending your neck just enough to pinch the cervical nerve root? In any event, this is a complicated case made all the worse with the amount of time it's been going on. I'd recommend sticking with the pain management group, but I'm not sure the nerve burning would improve a significant amount of your symptoms as it is usually to minimize pain from cervical facets. Can't remember if you've seen a physio, but finding one that has spine experience would be helpful. Just like all professions, there are good and not so good PTs so ask some questions before you sign up. I'd recommend you see someone who spends time doing manual techniques vs just handing you exercises. If you find a therapist who takes the time to peel back the layers of your dysfunction to find the root cause, then you may have a shot at improved pain management. Regards.