it sounds like you have something going on with your neck. if you are losing your vision periodically you really need to see a doctor preferably and osteopath pronto.
my head painfully pops at the bottom of my skull and top of my neck nothing drains. i can be sitting and it will pop. i feel it stiffening before it pops and then it usually does but sometimes it doesn't. also sometimes when i turn my head i will get a burning sensation down my neck. should i be worried? one last thing that happens is i will stand up and i won't be able to see and i will have to sit back down. can you help me decide what to do?