It is always best to have a definitive diagnosis. For this I suggest you can consult an orthopaedic surgeon ,physiotherapist or chiropractor. Once a diagnosis of winged scapula has been made ,rehabilitative exercises aimed at strengthening the serratus anterior muscle (and others) can be prescribed. The serratus anterior muscle which holds the inferior angle of the scapula medially ,is supplied by the long thoracic nerve. A combination of therapy including cervical and thoracic spine manipulation ,muscle activation and strengthening may be useful .A biokineticist is usually the best person to supervise and fine tune these exercises to suit the patient and the condition.
In summary ,you may need more than one of the above professionals applying their different skills .
Kind regards Dr Roberts