Your blood volume is increasing at this stage and it can put more pressure on your body to circulate. I felt sick and faint for a few weeks with each pg.
Don't do yard duty if you can avoid it, and consider going home early or getting help with kids tonight so you can just rest.
For right now, get some food and cold drink into you (phone the office to get your food from the staff room and send a child to collect it), sit under the air con or a fan and get some busy work happening with the kids. Phone admin if you need someone to take your class for a bit, just to regroup.
In the longer term, swap yard duty for indoor/air con duty (I did library duty or detention!); have iced water/cordial/juice and a stash of food with you in the room; let your boss/teacher next door etc know you're a bit 'fragile' (I started doing some combined lessons with another teacher - she'd teach, I'd prep, wander and mark or take a small group and my lovely boss would 'pop in' more often and chat with the class for 5 mins so I could sit/go to the loo etc) and set up a fan right near you.
Something else to consider is getting your heamaglobin levels tested. I'm sitting here at almost 40 weeks still feeling faint and sick and the Doctors have said its due to low heamaglobin. I have a blood disorder that causes low heamaglobin so the only way for me to feel better is to have the baby but with normal blood it's treatable. I hope you feel better soon.
It could be low blood sugar, low blood pressure or low iron? I've had low blood pressure in all four of my pregnancies and this one I also have low iron which is causing exhaustion, nausea, dizziness etc. maybe ask your doc to check all three?
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