Welcome to NT!
MS as well as many diseases can be difficult and time consuming to diagnose. MS has lots of different symptoms and effects each of us differently. There are many other diseases that can mimic MS so having a good neurologist and/or diagnostic team is really important.
Others gave some great ideas and suggestions. Please let us know how you are doing and what the results from your testing and dr. visits are.
BTW - Have they discussed the possibility of migraines? Migraines can definitely occur without a headache. I have only had 2 occular migraines and boy, were they entertaining. Lots of squiggly, zig zagged and sometimes colorful things going on in my vision. Just something to think about.