mrsryan I'm a teacher too (HoD) and I echo a lot of what you have just been saying, my department isn't in greatest state staffing wise either and with me going at Easter it's gonna get worse. I too have taken on extra classes etc but as I was having to go between different rooms (upstairs and downstairs) I have requested for my classes to be room changed to now be downstairs (with the exception of a couple where we have got disabled children who can't go upstairs in this block). Maybe see how you go first couple of weeks back and then get them to change it (others will just have to put up with it - classes can go back to original rooms when you go on mat leave). Anyway work has to do a risk assessment thing for you too and if you are suffering with spd then going upstairs is not going to help - if they won't change things get midwife/Dr to write note.
I'm also stressed with work stuff - parents evenings (got 2 first 2 weeks back), meetings, planning, marking, sorting out my part of the office (worse than sorting house out I think!!) so that my mat cover has somewhere to work, along with the standard every day work stuff. I've still got controlled assessments to mark, a controlled assessment to start, prepping my year 11's for exams and trying to relax....
Have also got some busy weekends coming up too so can sympathise with the lack of weekend time, but I don't have the masters to do as well....you must be a super teacher!
There are several of us on here who are teachers so we know where you are coming from x