My senior year of university I suddenly became unable to click a mouse. Perfectly fine before, and I loved using mice for normal work and things like First Pers

My senior year of university I suddenly became unable to click a mouse. Perfectly fine before, and I loved using mice for normal work and things like First Person Shooters. But suddenly the curling "clicking" movement of my index finger stared causing extreme pain. Still does, to this day, even making that movement in the air. Typing is fine for some reason. Transitioned to full-time TrackPoint use (USB ThinkPad keyboard), or TrackPad on my Macbook when I'm not at my desk.