What can cause this?

So at school I'm currently in my textile exam which is an all day exam so km not going back and form between lessons. Its a really calm atmosphere I'm just stitching but then out of nowhere I started feeling really anxious and sick and my hands started shaking but I want allowed to take a break. So, what can cause stiff like this? (I also get light headed easily and I'm tired most of the time idk)