dizzy, headaches, fatigue (14 weeks & 2 days pregnant)

I've been getting headaches a lot, not bad bad but mild ones. Especially when I eat!
Whenever I'm full just a little bit, or sometimes I don't even eat much but when I eat I start to feel like I can't breathe and the headaches comes.
I also feel lightheaded, I can't do much cause I get lightheaded/dizzy. 
It's like the sound in my ears go away. 
Im taking iron, and my prenatales.
Plus calcium and b6, and vitamin D and other supplements given to me by my doctor.
Is this normal? 
Right now I have a mild headache and feeling my nose semi clogged (I feel like I can't breathe properly) because I ate and feel full.