You don't need visible proof for it to be true. Emotional abuse is invisible, and that's still abuse, and just as wrong. In the gentlest possible way, why is the fact that you can't visibly prove anything a predicament? Do you want to leave him, and feel you need the visible evidence as a justification? Or is it something else? If you want to work things out with your husband, I think the fact that he will not apologise is very worrying - he doesn't seem to think that what he did was wrong.

Do you have support near you? Family or friends? Anyone who truly cares about you won't need to see a black eye to be supportive if you tell them about your situation. Is there someone you can confide in for support?