Hold your hand out in front of you like you're going to shake hands. Now, grasp your thumb inside your fingers (like a fist). Don't move your forearm, but bend your wrist toward the floor from that position. Does that provoke pain? (If this is confusing, youtube Finklestein's test).
Now, grasp the base of your thumb with the uninvolved hand. Push your thumb straight back toward your wrist and grind that joint around. Does that provoke pain? (youtube Grind test thumb).
If you pinch your webspace, does that hurt?
Lastly, what do you do for a living? Does it hurt at work at all?
pm me if talking with me would be more helpful.