I have to suggest you talk to a cardiologist. For a local anesthetic block that is good. I am more than willing to give it a try. Narcotic addition is not an option, I absolutely hate the feeling they give me. The cause still is not clear.
Treatment remains highly individualized with many, many medications being tried.
Bottom line remains no single good therapy. I have had patients on guaifenisen with good results. I start with a good evaluation and work from there. I have been having recurring pain in my left shoulder. I am not able to lift my arm above shoulder level or reach behind my back.