I was just about to mention that G, it's a life saver for the poor finger. That happened to my finger from spray painting too, I think it's a combination of the use itself and the constant cold sensation from the compressed air. Mine actually began feeling like it was blistered before it let up.

It does sound like over exertion to me also, the other stuff probably got exacerbated with all the activity from the project. I hope you'll at least call it all in to your neuro and let him/her decide how to approach it. We all like to blame anything else when this stuff happens, but it is happening and you do wish to go on with life, yes?