Why does head throb after a short and easy workout?

Okay first of all I’ve never really done much working out my whole life. I just recently started trying little workouts so I don’t totally wear myself out. So I only workout for maybe 15-20 minutes at a time. I always drink water before, during and after the work out. My husband is a US-Marine and he tells me that I need to eat before and after I workout. Well, honestly I didn’t listen to him at first. But today I did eat before I worked out. Anyway my problem is that if I’m doing something on the floor, like crunches or push-ups..the second I sit up or stand up my head starts throbbing and I feel like I might pass out. Although I haven’t passed out yet it is still bothering me, I just wish I knew what it is that I’m doing wrong so I can prevent it. Today I ate before I worked out and drank water…and my head was throbbing for a whole 15 minutes after my work out. I know I should have ate something afterward but I felt so bad that all I wanted to do was just sit and rest rather than walk around the kitchen trying to prepare food. I’m not overweight or anything like that. I think I’m around 5’6″ tall and I know I weigh around 113 lbs. and I’m 20 yrs old. I’m trying to work out more so I can just stay healthy and also I’d like to have more developed ab muscles..lol. If anyone can help me out to understand why my head is throbbing this way and what I can do about it I would deeply appreciate it.

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