I feel like my body is failing me.....

My LO is 10 weeks old and everything with him has been going great! Baby is EBF and growing well, perfectly healthy. But I feel like total CRAP. I feel like I’ve been hit my a truck....everything hurts. I have headaches, backaches, pain in my legs and knees when I walk....no clue where this is coming from! I just feel run down. Like I have the flu, minus all the congestion and whatnot. Do I need more vitamins? More rest? More water?

Is anyone else dealing with this...?