Why can't I breathe through nose after rhinoplasty? (Photo)

There are many reasons, but the most likely one is that you have a tremendous amount of internal swelling early on. It can take up to weeks or more for that swelling to resolve and for you to have a better sense of breathing. Then, it can take many months for the swelling to completely resolve. Outside of that you would be looking at structural causes of nasal breathing that could lead to this, but you are way too early to be worried about that.

Without an in person nasal evaluationI can only think you are internally swollen. But I am not sure. Best to seek seconf=d opinion if you are having this concern or wait a few months to allow healing...

There is often a lot of swelling after a rhinoplasty, so it is not uncommon that breathing can be somewhat troublesome until this swelling subsides. Usually this improves over the first few weeks, but it may take longer in some.