I'm just wondering if it's just me...

The last few days I've been super dizzy and having bad headaches that will lead to being nauseous but the dizzy spells are the worst... I will feel as though I'm about to just fall over, everyone keeps telling me it's because I had a baby and my body is adjusting itself but he will be 6 months old in less than a week and idk if that is the real reason. I'm testing my blood sugar and they stay between 109 and 120 so idk if it's a blood sugar issue or maybe I'm low on iron but I just need to get my head straight I feel so bad because I dont want to do anything but lay down lately. Please help...