oh no..... thats terrible.. ( sounds like soemthing I would do... I HATE changing blades!)
I'm thankful ur thumb will be ok..
and
I"m even more thankful that DH does nto read this board!! I'd never hear the end of it! he would try to take away my cutters.... altho I have NEVER cut my self with the rotatries or a razor blade.. I cut my self with dumb stuff like.. the finger nail clippers or the letter opener..* ... sigh....don't ask*......