Get a Visual Pain Scale
Tracking your pain is a helpful diagnostic tool when dealing with repetitive stress injuries. A visual analog pain scale like this lets you bypass the cognitive level of your brain and give a truer representation of your pain. Print out a number of copies and start a file to track your pain level over time.
Track Your Problem Tasks
Keep a file on your pain near the work site for every problem task you have identified as a potential cause for your injury. Pull it out and record your pain every time you perform that task no matter how long it is for.