What can be wrong with me?

So I've been getting light head and sometimes feeling like I might pass out, I also have been getting extremely tired towards the afternoon-evening. I'm taking vitamins so I wouldn't think I'm low on anything. But I know both my sister and mom are anemic. But when I was getting checked when I was pregnant I was good on iron. So idk what can be going on with me. Does this sound familiar to anyone or know a possibility of what it can be? I need to make a Dr. Appointment but in the process of looking for a new dr.