My thumb is not swollen but I can't tell if it is jammed or swollen, any movement causes a sharp pain.

Thumb joint problem. You complain about pain on motion of one of the joints of your thumb. You can get a finger splint at your local pharmacy which will stop you from moving it. You can take Ibuprofen, Advil, (ibuprofen) Motrin (all the same but for spelling every 8 hrs. Dose is wt (kg) x 10 mg/kg every 8 hrs. Easiest to take 7AM - 3 PM - 11 PM.