Hi I am 36 years old. I have had two cervical disc replacements two years ago. I am also being tested for MS. Right now I am getting weird spells where i get really dizzy and feel like I am going to pass out or really shut down. I also start breathing very shallow. They happen about every 5-6 minutes but only for a second. My eyes get blurry, head gets fuzzy, then it goes away but leaves me with nausea. Then it will happen again almost like a pulse, very repetative. Then hours later it stops. It feels like it starts from the back of my neck and goes right to my head. My neck has started popping and grinding just recently and this feeling will also happen when I lean my head to either side. Does this sound like it would be related to my cervical disc replacements or possible MS? This is really scaring me but I don't want to go to a doctor again and have them tell me there is nothing wrong. Any answer would be helpful. Thanks.