I have a heart problem it's weird to explain the heart it's self is okay but when I stand up to fast…

I have a heart problem it's weird to explain the heart it's self is okay but when I stand up to fast I faint or everything can be find and I'm sitting down I get sick. I went to apt today got very hot my pulse was 130 and almost fell out so the sent me to Acute care to check my heart my heart was up when keep standing up or walking but was fine when laying down. So not going to be able to drive cause we do not know when these spells will hit something I had with My youngest in 2015.