couple days ago I woke up, got very dizzy and barely made it up the stairs. I pulled out some leftovers and tried to dish some up for a late breakfast but I had to sit down because I nearly fell over. I got extremely hot, and it wouldn't go away. it lasted for about 3 minutes till I was dripping sweat and I found it helped as I put my feet up on a chair beside me. it went away as I got very cold and almost numb, it was bearable but odd. I tried again to get some breakfast but it happened again. I put my feet up again and it went away and didn't happen after that. any ideas on what happened?