When I stand up after bending down I get dizzy.
I get dizzy quite a lot during the day and feel very hot.
Also, sometimes when I get up and start walking, my legs feel like jelly and start shaking, sometimes my hand start shaking too
The thing is, that when my mother measured my blood pressure with her home do it yourself machine, my blood pressure was normal.
So what could this be? Does it have anything to do with blood pressure?

And if it helps, I am 19 yrs old
thanks for any help given