Hello everyone, I am 23 years old and I have been feeling very dizzy and nauseous here lately. I got so dizzy today that when I was walking up the stairs in my house I almost fell down. What could be wrong with me?

There are a lot of things this could be, and noway anyone on the internet could tell you what it is.

If you have symptoms that interfere with your life (like being afraid of falling on stairs) then it's time to see a flesh-and-blood doctor.