Yeah! I got a name and an idea of my condition.

My story is about the exact same.

Got a flew shot in left arm.
A week later I wake up with severe pain behind the left shoulder blade area. Numbness in left arm, mainly around elbow, numbness in fingers. mainly my pinky finger, and ring finger. I also loss coordination of pinky and ring finger. Could close fingers, but had a hard time opening. Could not type with them.

Pain lasted about 3 weeks. Doctor put me on anti inflamatory and pain meds. thinking that an inflamed muscle was pinching a nerve in my back/shoulder.

I have extreme loss of strength in tricep and pec. muscles. Muscles wasting away. Can barely do push ups, dips, tricep kick backs, etc.

Went to Orthapedic Surgeon. Got an Wikipedia reference-linkMRI and X-Rays which were inconclusive. Surgeon thinks I have brachial plexus nerve damage. Sent me to get nerve study.

Went to nerve study. Test shows there is nerve damage.

Dr. says nerves heal at a rate of at best 1mm a day. Dr. thinks that I will recover in about 2 years based on the amount of damage that I have.

He said to not drink alcohol, because nerves do not grow well when you drink alcohol.

It has been 8 months since initial pain. I am recovering very slowly.

I have been working out regularly and am up to about 20 push ups, and I can bench about 150 lbs.

I use to bench about 275 and could do 60 push ups pretty easily.

So in about another year or so I am hoping to be near 90%.