Is it normal to get really frusterated

I have a son that just turned one and im currently pregnant and going through all the hormone chnages and cry for everything and basically feel like shit all the time and my son has been really close to me lately more than usual he doesnt want to leave my sight, i cant even turn my back on him because he starts crying like if im leaving forever. Today hes been crying all day and i got to the point that i went to my room and just threw myself on the pillow and cried my eyes out of frustration and also because i feel bad for getting frusterated. My husband makes me feel as if im over exaggerating but i know im not but i just want to know if there are other mothers out there that have felt the same as me and if they can give me any advice, thank you