ILL!!!! please help

Samantha
Hi this is my first post. I am currently 7 weeks with my 2nd child, I am feeling horrible and would love it if anyone could give me some tips to improve/give me more energy. My back aches so much, I am constantly tired ( got a 6year old so naps ain't the easiest) headaches on and off and just generally no energy to do anything. Please please help xx