Dizziness

I've always experience that wen I get up I get light headed and vision goes away for a few seconds the comes back to normal I've always been told that it's because I get up to quickly and this morning around 10 I was laying down in my living room and I got up to turn the air on but it didn't happen until I crossed half of the house I just stayed still and waited for it to go away but this time I felt really hot and my body went weak to the point my legs were giving up on me for a second I thought I was gonna faint it was impossible for me to move for about 3 to 5 minutes which seemed like forever to me hopefully the kids were a sleep but I'm wondering has anyone experienced something similar I'm scared it could happen when I'm not home and definitely not driving until I know what's going on