Here's a link to possible treatments for chronic pain (by American Chronic Pain Association): www.theacpa.org/documents/ACPA%20Consumer%20Guide%202010%20010410.pdf
You need to ask your doctor, but I've not heard of sacroliitis causing breathing problems -- yes, it can & if not fully treated often does travel down the legs and/or up the back to the neck. Could it be just that the pain is indirectly causing it (either by wearing you out or by aggravating asthma or some other condition)? Like I said, I'm not a doctor. There are conditions that can cause breathing issues, but they typically occur much higher up the back. But maybe you have some kind of an usual case. I would check with your doc about
that. Just fyi ... here's a link for more info on that condition: www.mayoclinic.com/health/sacroiliitis/DS00726
It's not unusual for those of us with CP to have multiple diagnoses. I only bring it up because you might even receive complete relief for one thing & still be in substantial pain from something else.
Whether or not they work, if you have been working up to this point you should be able to return to work the same day or next day, unless you get sedation (may be offered, shouldn't be required). I never do any shots under sedation. I just don't see the point. The shots are over so quickly.
One thing you might consider is seeing a pain psychologist. They specialize in working with chronic pain patients & teach us behaviors to help prevent/limit pain as well as techniques for coping with it so that it has the lowest impact possible on our lives. They don't do the typical "talk therapy" you might typically associate with psychology. They use more of a problem-solving approach & usually visits are limited to a certain number of sessions needed to teach you the techniques. I'm not sure what's available in your particular area, but we have had Canadian pain psychology students post research studies here in the past so your doctor should be able to help you get in touch with someone.