HI Crystal,
we seem to have a lot of things in common, I have a 5 year old daughter and a 1 year boy I just stopped breastfeeding cause I have started medication, and I felt for the last 6 months horribly faint and had muscles aches especially shoulders, I had jerky legs I was not having proper sleep at all. I felt so exhausted that I could not believe there was nothing wrong and did lot of tests and all came back negative. DON'T WORRY it will probably take time but it will get better, try to eat when the baby is sleeping or with somebody else cause when he will be there you will tend to have KNOTS IN THE THROAT and give up quickly. and try to look on the Internet for ways to boost your energy and good luck any other concen I AM HERE....
