Was feeling ok; today I feel terrible

esd

I'm 9 days post c/s. My pain level is fine. I haven't had to take the Percocet since sat. I am BFing, still taking my vitamins, and Advil as needed. DS is only waking every 3/4 hours at night so I am getting some rest. This morning I was extremely crampy and lightheaded. I did call my dr and they said I need to make sure I'm eating and drinking enough water. The nurse said it was most likely hormones balancing out. I was just at the dr yesterday and she said my incision looked great. 

Anyone else experience anything similar? Advice on what to do?