is it just me?

For the past few weeks Ive had my guard up put up a wall higher than any wall ever imagined and Ive been lashing out. Just angry. I don't know how to get over it or help it or anything. everybody has been telling me it's because I gave birth not that long ago but Ive never been like this this feels bad. Any tips comments would be welcomed. Im pushing everybody away it seems. =(