I Fall Down Or Get Waves Of Dizziness A LOT!

I fall down or get waves of dizziness A LOT! My head sometimes feels like there brain fluid is swimming. I don't know why this is happening. Sometimes I can catch myself. I just got tubes out of my ears. But I was doing this before I had the tubes put in, just not as much. Sometimes it feels I can't lift my legs high enough when coming up stairs. Why is this happening.