Why???

I had a miscarriage last month and ever since this have felt angry .. my mood swi vs are awful and I'm not really very nice to be around . I've had a lot happen this past year .. my dad unfortunately passed Way very suddenly in front if me I have two you you get children gone through a divorce met someone and he's desperate to start a family although I am happy to take our time although since the m.c I have felt very angry and my feeling have changed towards him . this makes me feel awful as I am not a bad or horrible person I am just unsure of why I feel so negative at the moment towards him as he is the best thing that's happened to me in years .....