Some times when I workout or do a physical activity like playing football I start to lose energy get breathless and dizzy and be on the verge of fainting. Most of the times it has occurred is due to me not eating before I've done the activity. I understand I need a source of fuel.
However one time I was playing football only an hour after breakfast and started to feel breathless, I ignored it and carried on but it never went away and I started to get dizzy. I don't understand, I had breakfast only an hour ago. Is there something I'm missing?
How do other people do physical activities without getting so breathless? Should I see a doctor?