What Causes Slurred Speech Along With Blurred Vision?

hi, my name is victoria. I have these episodes where I loose ability to talk slurred speech, hissing in my ears, blurring vision like a tv screen, sweating so much that I m dripping, feel hot and cold at the same time, feel like I m going to poop pee and vomit all at the same time, I turn super pale, I have checked my heart during these episodes and it shoots down to 40-50 bpm. I also cannot move my body its like my strength quickly drain from me as I go into this episode. my breathing becomes very heavy. I have had these episodes while driving while walking around at work any time any place randomly. please help. I m 26 now but had this since I was 18.