I had a lot of dizziness at times. Some was from the vertebral artery being pinched during the worst time of RSI/TOS injury.
All the muscles in my upper back and neck were very tight and pulling in a uneven way on my c spine. I did have some minor c spine misalignments but I don't know if that was due to the spasms or if it was that way first and got worse with the injury..
the old what came first -the chicken or the egg thing...

If it is only when you look up it could be a c spine issue.. have you had any x ray or MRI recently to check for that?