I have episodes of vertigo for about 2 years, happens following a “buzz” in my head?

Hello,

I am a 24 year old female, and have been having issues with random episodes of vertigo for about 2 years. I didn’t really start keeping track of how often they were occurring until a few months ago. I get them about once or twice a month, and they only last a minute or so.
Like I said, they come on randomly. Recently when they have occurred I have been just sitting at my desk, doing sit ups, and lifting weights (three separate occasions). As weird as it sounds, I know when I’m about to get an episode of vertigo because I get this weird buzz in my head (kind of like when your legs fall asleep), and then the vertigo hits. The whole rooms looks like it is spinning. This usually only lasts for a few minutes, I just try to sit still and breathe, and they go away.

I’m generally healthy. 5’4, 135 pounds. I was diagnosed at birth with pulmonary stenosis, but had a valve ballooned at 10 months old, and no longer have to see a cardiologist. I work out about 4-5 times a week, cardio and light weight lifting.

Any idea what could be causing this issue? I’m terrified when I google the symptoms online they mention brain tumors or TIAs. But at the same time, I’ve had this for about 2 years now, so I feel like I would have other symptoms if it was one of those two (hopefully). Any insight would be greatly appreciated.