My Outer Three Fingers On My Right Hand Have Been

My outer three fingers on my right hand have been getting sudden sharp pains when I grip things. I believe this started from overuse especially with handheld power tools. I have started physical therapy and we are stretching the the ulnar nerve and muscles around it. After my 5th session, I now have that pain most of the time and it extends from my fingers to my elbow. I stopped the recommended 6 times a day stretch after my last session because I am now getting that sudden sharp pain very often, from the slightest action. Does this seems like the correct action? Is there more reading I can do? I have a PhD in chemistry, so have some understanding of technical reports.