Dear Sir
The pain site of your hand indicates over an injury of repetative strain to the TFCC of lunotriquetral ligament, you have to be seen clinically followed by investigation like an MRI to get to the exact cause, and provide you with some treatment, as a primary investigation you need to get an X ray of your wrist done.
Next Steps
Get X ray wrist (left) PA and Lat views and send them to me