The only term I could think of is defeminization.
It seems like most people understand what emasculation is and the things that cause it.
What are some examples of situations that can cause the feeling?
Edit: changed effeminization to defeminization.
It is not a very commonly used word, but I think the word you are looking for is “defeminize” - it’s the closest ‘clinical’ English word I’ve heard - every other word to describe the feminine equivalent of emasculation is either slang or a slur.
Yep, that was a brain fart right there.