@VICK13 yes I've had this too and was one of the symptoms that led me to seeing a Neurologist. I did lose consciousness a number of times and ended up in A&E. It also happened when I was waiting to be seen in A&E and I ended up in resus. Ha2d my heart checked no problems found and blood tests all OK. A & E Consultant did say it could be Neurological problem and wrote to my GP. My GP wasn't interested either. I also found ny balance after these events was off and I would lean to one side and be very fatigued. Neurologist dismissed as anything to do with MS . Diagnosed with vaso vagal syncope. Multiple lesions found in brain and couple on C Spine after MRI and he did say it could have been due to a spinal relapse. I felt it was connected to MS but not every symptom is and it's always worth investigating other causes . It's always difficult and upsetting when you feel you're not being listened to. You know your own body best so don't give up if you feel something is wrong. Has the falls clinic been any help to you ? Take care and be your own advocate.