working until due date

I'm a teacher and I'm currently 34 weeks and 5 days. Report cards will be coming up in the next two weeks and I'm having a really hard time getting through the day never mind completing all the marking and extra work that needs to be happening. I was in a car accident at 29 weeks so now I'm also dealing with whip lash and sciatica pain from the accident. I am going to physio once a week but it's still very painful. I also have bad swelling where it's painful to walk near the end of the day. Lastly, my blood pressure is slowly rising but still somewhat normal (138/87). What should I do?