I am 23 and I work as teacher. Normally I travel about half an hour on school van at morning and afternoon and everything was quite normal. I never had any issues with travelling. But about a week back I have started working out in mornings before I go school so as to stay healthy. I have 1 cup milk and light breakfast regularly. And I feel I have fair amount of water as well. But since a week I feel totally exhausted ,my head goes round and round, I am kind of suffocated and all sweaty at bus and by the time I reach back home I have no strength left n all I do is crash on my bed under the fan and fall asleep. When I wake up everything is again back to normal. Why is this happening to me. Please help.