I've been dieting and I think I'm not eating enough, advice?

Basically, I feel like total crap. I'm tired all of the time, I'm cold all of the time, and I just don't feel perfect.

This morning I woke up and rushed to the fridge to eat my typical non-fat yogurt and fruit salad. After getting it ready to eat, I practically collapsed on the floor and I couldn't breathe. As soon as I started eating I felt better.

Usually, I'll eat fruit and yogurt for breakfast, boiled chicken breast and broccoli for dinner, then two whole grain-granola bars for dinner.

Am I not eating enough? Am I making myself sick?

I'm worried, but at the same time I want to keep losing weight like I have been.
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Thanks for all of your responses guys.
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Jesus Christ, all of my questions get so many views it's really weird.
I've been dieting and I think I'm not eating enough, advice?
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