Bill, Hi!
Like you, I’m waiting for the vaccine. I’m over 50 and in the UK, so should be offered the vaccine before the end of April, I think. I’ll be taking it. Again like you, I was encouraged to have the winter flu jab in January, so I had that and felt noticeably rough for a day or two. I expect the coronavirus jab to be similar.
My mum has had the jab and had zero side effects. My wife has had the jab and was as rough as anything for a week. Her mum has had the jab and was fine, I think.
When my wife (who works in the health service) had the jab, everyone in her office was offered the Astra Zeneca jab and several of them had some temporary side effects, like my wife, but few of them for as long as her.
In terms of risk of the virus to those of us with strange stuff going on in the brain, I found this document on the Association of British Neurologists web site last March. It does talk about risks of the virus re some neurological conditions but doesn’t seem to have been modernised since last March. It might be useful for you.
Hope this helps,
Richard