Dizziness

For a couple of months now, I've been getting little dizzy spells.  At first I didn't think much of them, because they were few and far between, and I figured I just needed to eat or something.  For the last couple of weeks though, it's been happening frequently and with having the kids with me all the time, I figured it was time to see what was going on.  I went to the doctor today and he isn't sure what's wrong.  I'm going in tomorrow for lab work and hopefully that will give us some answers.  He said that it could be my thyroid, I could be anemic (which apparently can happen to breastfeeding women), or any number of things really.  He said if the tests don't give us any answers, the next step would be to do an EKG of my chest.  He said he's not too worried about that though, as my heart sounded great.  I'm just hoping that whatever is causing this, there is an easy solution.