I’ve been to two classes now and after both, I’ve felt really dreadful. Sick, giddy, whoozy. And the feeling goes on for hours. In fact, I did the class yesterday and I STILL feel a bit sort of travel sick now. 
I told instructor the first week and she said it might be blood pressure, drinking more water during the class might help. But it made no difference.
I understand how lying on the floor doing exercise and then getting up to standing might make you feel giddy for a moment or two. But not 24 hours later?
Anyone else had this?