I had shoulder surgery to repair an A/C III separation (left shoulder) a coupe years ago and over the past year or so I have had a few very minor tweaks while doing various activities. I am now experiencing numbness in the first three digits on my left hand almost constantly, and when I try to lift my arm, or lower it after being lifted, there is some popping and needless to say it is very uncomfortable. I am just wondering what I can do for this, should I just continue with regular activities or limit the amount of stress I am putting on it? I work as a refrigeration mechanic which requires a lot of heavy lifting and work in akward positions and have found it to really be hindering as of late.
I have already seen a neurologist who says the nerves are in good shape, where should I go from here?

Thanks