feeling irritable and sad while restricting

i decided to eat a full meal today because i felt so nauseous and i haven’t been losing weight even though ive been eating very low calories daily. i got my food and my order was completely wrong and i literally started crying for no reason😭 i think it’s because i wasted calories on something i didn’t even want and it makes me feel so shitty. Also my emotions go from 0-100 and i just either get really angry or sad randomly, is anyone else struggling with this?