Feeling faint/light headed

Today I nearly fainted in the middle of IKEA and a woman even came up to me to ask if I was okay so it must have been pretty obvious. I've been feeling a little lightheaded the last couple days but never like I was going to faint until today. I was anaemic from about the half way point in my first pregnancy which caused me to be like this so I'm wondering if I should go get my bloods checked again (it's only been a month since I last had my iron levels checked). Anyone else feeling faint?