What a or what?

Hi,

1. When you want to express your surprise by saying "What a big apple that is," it is normally expected that for a countable noun, a person should use an article before it and for an uncountable noun, a person shouldn't use an article before the noun like "What peace of mine. I have peace in me."

Now, can I use an article in that expression to express a kind of something as in the case of uncountable nouns, especially for those used to express abstract feelings, like this?

Oh, what a happiness I am feeling this morning. My arthrisis is gone suddenly and I just receive a notice saying that they found my lost watch that has a special nostargic value. I am so happy; I can dance on my bare feet.