How do I know if I am overreacting/overly sensitive/unreasonable or if he's just saying that because he's mad?

I know that I do overreact on occasion and can be emotional/hormonal at certain times of the month. I'm fully aware of this and pretty much know when I do it. But why does H say that I'm overreacting or being unreasonable every time I get upset? Is he just saying that because he doesn't like my reaction regardless of whether it's reasonable or not?

How do I know or figure it out without basing it on what he tells me?