She posted here about ten or eleven months ago with symptoms exactly like mine but hasn't been online on this site since. If anyone knows her, please tell her to check her inbox as I'm keen to hear if she found out what this damn annoying tinnitus synchronous oscillopsia/nystagmus is! I've only found two others in medical text books with this symptom and one was due to multiple sclerosis, the other they never found the cause.
https://www.tinnitustalk.com/members/jennie-mae.5252/
https://www.tinnitustalk.com/members/jennie-mae.5252/