glenntaj-
some of your shoulder pain and symptoms sound almost like thorasic outlet syndrome{TOS}.

weightlifters can and do get it - so be cautious- with your rehab.
plus it is a somewhat repetitive motion injury /posture related issue too.

If your interested in more info or links about TOS see out forum here and our stickys.
TOS info: the first links in our sticky list
http://www.nismat.org/ptcor/thoracic_outlet/
http://tos-syndrome.com/newpage12.htm
http://tos-syndrome.com

this has the weight lifter references-
http://www.acofp.org/member_publications/thoracic.htm