While I know how to make exclamatory sentences with nouns or adjectives (or both together), such as: "what a big animal it is" etc. I don't know how to build exclamatory sentence with a main verb, for example, when I want to show how much I love my spouse: "What I love you" absolutely doesn't sound to me natural. On the other side "How much I love you!" sounds to me a little bit interrogative sentence. So I'm not sure about that.
In many languages, exclamatory sentences with verbs start with the question word "how", but I'm not sure about English that normally use "what" instead as above.