Thumb injury

I've strained or jammed my left thumb, I think in the movement I've been using for the past couple of months to pick up my messenger bag (usually laden with my laptop computer and at least one casebook) and put it over my shoulder. Not only is it hurting to pick up my bag, but also it's hurting to open my cell phone, pull clothes on, do housework, cook a meal, etc., etc., etc.

It's pretty clear to me where the arthritis is going to start, if it hasn't started already.

I'm too old for this nonsense. Law school's not made for people over 30.