Peter, it sounds to me like you may have latched on to what the nurse said, and now you're watching for and tuning in to all signs. In short, like many of us with anxiety do, you're making yourself sick thinking you could be sick.
I have severe OCD and went through my own round of health anxiety. Altzheimers runs in my family on both my mom and dads sides. When I would walk into a room, stare at something, forget even the slightest thing I auto thought altzheimers. Asking my siblings about it and googled it looking for signs I had it. I then spoke to my psychiatrist about it and he explained to me that due to the OCD my mind runs non-stop and at times it shuts down completely due to the over-activity. This made a lot of sense to me and I stopped believing I had altzheimers.
The thing with health anxiety is that we keep it going by googling it, talking about it, and looking for signs of whatever condition we believe we may have. In effect by doing all that we are telling our brains something could be wrong and just keeping the fear going. The only way to beat the health anxiety is to stop all the focus on the condition concerning us. Easier said than done, but it can be done.
I like meditation in the form of going for a walk and really paying attention to my surroundings complete with touching things to check out texture. I also use the notice 5 things techniques to get my mind off my worries and calm myself.
Even if you do have signs of altzheimers or dementia, which I doubt, absolutely nothing can be accomplished by focusing on it.
Best wishes to you
