What to eat when working out

I´ve been going to the gym for about a month and i think im not eating enough, because last week while i was doing cardio y felt really dizzy and i thought i was going to faint. what shoul di be eating during the day, my friend tells me im eating too little (i eat about 900 calories per day) and i workout 4 to 5 days a week 2 or 2.5 hrs. I think that what i eat is enough for me, so i would like to know your opinions. 

Edited Jun 28 2013 13:10 by coach_k
Reason: Moved to fitness as more appropriate, I think...

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