As you mention your symptom in form of left sided squazzing type of chest pain
radiating to left shoulder,arm,wrist .....this all suggestive of myocardial infarction
You having rest pain which is sometime aggrvated by activity so unstable angina
is most probably is the cause.
Friend my advice is consult your physician as early as possible,do ECG,cause this may be the emergency.
You also mention lump under left collar bone,may be this lump pressing nerve so numbness
of face or numbness of face may be presenting symptom of MI.
So consult your physician as soon as possible.