Thank you all for your replies. It is helpful to hear from others dealing with some of the same issues. I found parts of that video useful in expressing some of what I am experiencing.

One more thing:
I was just reminded this evening that I had sustained a concussion back in 1996. I missed work for a month for it, but I don't remember what the symptoms were and I haven't thought about it in a long time. I never noticed any long-term problems from it. Neither my doctor nor my neurologist know about the concussion. Will the fact that I have had a concussion previously have an impact on my treatment?

Thanks again.