Hi: I have exactly the same problem, i will be walking along and all of a sudden i will go down, i know im going down, i dont pass out, but i cant stop from going down, ive got stictches on my forehead from falling and hitting the air conditioner grate plus big scar, it went clear to my skull on that one, got another scar on other side of forehead from fall in neighbors tarred driveway, and just recently i got black eye and i do not know if i did damage cause i wouldnt go to hospital. i think i did, cause i am still sore in places around the eye. Now i am afraid to go walking and just do what i have to do. I have done this for many years, im 72 now but i did it when i was 50. My husband is near end stage of lung cancer i cant leave him alone but i need to find out what is wrong, this is scaring me, i dont know how many more bumps my head is going to take. Im asking with you if theres anyone out there that knows anything or anywhere to go, please let us know. this is terrible. I feel for you and anyone that has it. Thank you