question: Hello, I ve been having random moments where I ll just be in the middle of doing something then all of a sudden I get this sort of sweating sensation then start losing my hearing completely then my vision turns completely black and I just have to hold myself up but I never actually collapse and lose consciousness just feel weak holding myself up with no vision or hearing. If you could tell me what this most likely is that would be great as I can t find much about my specific symptoms. Thank you!