Hi Nikki,
If your child was ill and has slept with you it sounds as though you have got what she/he had! I wouldn’t worry about body aching if you’ve got other cold symptoms!
As long as your breast isn’t swollen, red, very tender or oozing anything then I wouldn’t worry! I would just make sure you continue to sleep propped upright and take it easy 🙂
Keep us updated! Good luck xxx