About an hour or two after I woke up today, I started feeling really weird in my head. I don't feel like I'm catching a cold but I feel like I got injected with something and now my head feels weird. The rest of my body feels a little weak too. I had breast cancer in 2013 along with chemo for 5 months and I don't know if the feeling is a set back from the chemo. Not sure what to do. I also know that my iron is a little low. Could this be the cause?