Weird feeling/numbness from left pectoral muscle down inside of left arm into palm?

This all started a little over 4 months ago. I was picking up a heavy, glass vase at work and it shattered, cutting both my thumbs symmetrically. I had to get 4 stitches in my left thumb and 6 in my right. I immediately could do almost nothing because you need your thumbs for even the simplest everyday tasks.

While my thumbs have healed well (No tendons or nerves were cut and I regained full motion and strength), I haven
 
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