As you mention that you had a severe collarbone break, I remember what drove me to triathlon.
I have been a rugby player for years but stopped because of a severe problem at the joint between collarbone and scapula.
I couldn't stay without moving my shoulder more than a few minutes because of a irradiating pain and had no force in my arm, was unable to lift my elbow higher than my shoulder, unable to drive, etc.
All my back muscles were painful and sore, it lasted until I began to swim again and reinforced my shoulder ; sorry, seems not to be the best solution for you !
Your problem could be partially related to your collarbone.
I hope you'll feel better, good luck.
I have been a rugby player for years but stopped because of a severe problem at the joint between collarbone and scapula.
I couldn't stay without moving my shoulder more than a few minutes because of a irradiating pain and had no force in my arm, was unable to lift my elbow higher than my shoulder, unable to drive, etc.
All my back muscles were painful and sore, it lasted until I began to swim again and reinforced my shoulder ; sorry, seems not to be the best solution for you !
Your problem could be partially related to your collarbone.
I hope you'll feel better, good luck.