10/10 shoulder pain help

Hey folks I’m a 26 year old male about. 6’5 in height. I’ve been dealing with pain in between my shoulder blade and spine. It seems to also radiate to my lower front rib cage. All on my left side. The pain in the shoulder feels like someone is holding a blow torch under my skin. It’s extremely painful and would probably make some cry it’s so bad. But I’ve been dealing with it for years. Also in the past year I’ve gotten on and off bad neck pain. Bottom of the skull shoots pain through my head and causes headaches. Currently seeing a chiropractor who is supposedly the best around. He said I should be feeling 80% better in the first 3 months. Well I’m at about the 3 month mark and this past week and been some of the worst pain I’ve ever dealt with this issue. I dunked a basketball when I was about 20 year old with no stretching and i remember my shoulder hurt in that moment. Didn’t think much of it. Ever since it’s been on and off hurting. It’s been basically non stop for the past 2 years tho. I’ve had about everything under the sun checked and ZERO answers. My chiropractor is the only person to give me an “answer”. He says it’s cause my posture and my spire isn’t inline. But I don’t know how much of that is the root cause. I’ve had MRI, x rays, CT scan, blood work, esophagus checked with the camera, heart ultrasound and ekg. And I’m sure a couple other things I can’t think of. Other than the chiropractor I have an impartial right bundle branch block in my heart. Was supposedly is normal for tall men who are active. Not sure if that is what was cause. So we checked my heart. So I’m lost. And I’m tired of living like this. Currently as of yesterday. Trying to work out, and work out the specific muscles in that region to strengthen them. Any tips or ideas of what this could be would be great. Thanks.