Am I being unfair?

So I’m a stay at home mum to a 4 year old and a 1 year old, my 4 year old has been really stressing me out lately with constantly crying and throwing a tantrum when things don’t go her way, I feel exhausted all the time even after taking folic acid tablets the doctor prescribed me, and then when my partner comes home all he does is sit there and do stuff on his phone. I’m not asking for much, I’m not asking him to clean the whole flat top to bottom everyday when he comes home from work, I’m just asking that he helps me with our daughters, like change the little ones nappy or get her in her pjs, take her to bed but he does nothing with them! His excuse is that he’s been at work all day so he shouldn’t have to come home and help look after the little ones, I’m expected to do it while he sits in his arse watching useless videos on his phone! Even when I don’t feel great like right now I feel panicky and struggling to catch my breath I still have to get the kids ready for bed because he is too lazy to help me!! I feel extremely stressed and he just does not listen to me or help me!!