Muscle Issues after Clavicle Surgery

[KADEBU]

Hello, I am a US citizen living in Africa.  On March 17th 2018 I had a motorcycle accident.  End result was a broken clavicle, 7 broken ribs, a collapsed lung, two vertebrae breaks on the "wing" of the vertebrae and numerous abrasions.  I was in the ICU in South Africa for 12 days.  I  had internal reduction clavicle surgery which left me with a plate and 7 screws.  Now 4 months later I am experiencing extreme shoulder, upper pectoral, and upper back muscle tightness.  My shoulder along with numbness at times has a sensation of pressure almost as if something heavy was sitting on it.  My question is has anyone else had this experience after clavicle surgery?  I realize I had a lot of other injuries that left me unable to move well for several months and that muscle atrophy could be another cause as I experienced that along my right side upper body back, arm, and shoulder.  I am just trying to understand if this is normal and will pass with time?  Also, after almost 4 months can I go back to lifting weights or will this add to the issues I'm experiencing with my muscles.  I am a 38 year old male that was very active and into crossfit prior to the accident.  Would appreciate anyone's experiences with these types of injuries.