Do I have to back to work if I left with a doctor’s note which states a week off but manager still pressuring me of when to go back?

I was in charge of the kitchen. Part of my responsibility was to slice vegetables. The machine had been missing the gloves for about a year now and the slicer machine gripper to hold veggies to slice for about a week. Therefore not having the grip, I had to use both hands. Yesterday, my hand slipped and I cut my thumb. I went to the emergency room and got 4-5 stitches.