What does it mean when your husband is strangling you in your dream?

Strangling and choking are interpreted similarly in dreams.

When you are struggling for air, it shows that your unconscious mind feels threatened and deprived of life.

This is not usually a literal thing, but more often your mind's way of balking at restriction placed upon you by outside forces.

In this case it may not be specifically your husband, but perhaps the "demands" of marriage" that you feel are restricting your freedoms/life.