Stressed Out

So My boyfriend and I have been together for three years, we have a son that will be two next month. We have been through a lot of ups and downs during the relationship, but our most reoccurring problem is stress from work. I used to work at a care home but I left because it would cause a lot of stress and now I work in retail. He has been working in sales for almost three years now but a few months ago got promoted to assistant manager. For the past Three months he's been working 9-9 with two days off and when he gets home it's like walking on eggshells the slightest thing irritates him even if he doesn't realize it. We're supposed to be moving in together again in February but with his attitudes and smart remarks I feel as if I don't want to move in with him. I try to relieve some stress for him like doing a little cleaning here and there or cooking. But i feel that he thinks I'm supposed to clean every time my son and I come over and it's really irritating. And when I do all these things to try and make him feel better I feel as if he forgets about me and I'm just supposed to pamper him all the time when I get little in return. How should I go about bringing this up to him?