I had the trigger point injections multiple times. I found them to be very painful. Excruciating at times. Especially since my one muscle was so knotted and tense the one time that the needle almost broke in my back..... (not trying to scare you, this was my personal experience though....) I was in horrible pain / flare ups each time for a week or so afterwards.... And barely could get out of bed / off the couch due to the pain.... With zero relief from any of the several I had done... The Dr would inject anywhere from a dozen to 2 and a half dozen in one appointment..... I wish they would have helped.... I truly believe it's based on person to person for how your body will handle it. I have had two epidural injections in my neck and one in my low back. I didn't get extreme relief from them, I did notice less zapping/ electric shocks in my hands and feet though, and I didn't have a headache for 2 weeks.... But once the headache came back, boy did it seem worse than before.... But again, the needles used irritated me just like the trigger point injections did... The trigger point injections are more for muscle issues, the epidural injections are for nerve irritation, ridiculopathies, and such from bulging and herniated disc's....
Again this is solely up to you, as results vary person to person. It wouldn't hurt to try once and see how your body tolerates it and also if you notice a difference.... I would suggest that you do either neck or back first, I wouldnt personally recommend doing neck and back in one session... Also it may not hurt to have someone drive you to that appointment just incase you do experience pain.... (when I had mine done, again the pain was so bad I could not turn head to be able to drive properly....)
Best of luck to You! Let us know if you have them done and keep us posted on how you respond to them If you choose to have them done!