I'm so sorry you're going through this ... One of the things that drove me to try HRT was my fear that I was definitely suffering from early onset dementia. I was absolutely convinced. It wasn't like having a 'senior moment' (I'm 53), more a case that I couldn't trust myself to remember anything of any relevance. I was terrified that this would lead to me messing up so badly that something horrific would happen and it would all be my fault.
Well, the good news is that I didn't have dementia, instead I was massively struggling with anxiety. I was trying to tough it out, and I was paying a very heavy price for that.
I don't know what to suggest, because I did find herbal remedies helpful (with massive slugs of valerian) and I did manage to get into therapy on a sliding scale (£30pw). Other stuff that helped were: making sure I drank 2 litres of water a day (it was a little thing, but part of me being super conscious that I was taking care of myself), breathing techniques (in for 4, hold for 8, out for 6, still do this all the time), gardening (somehow digging around in the muck slows my brain down), wearing headphones when out and about on my own so I could be in my little world (listening to podcasts), couch to 5K (because it's a routine, even if I could only do the speedy walking version due to general podge). I think what I'm saying is little steps.
You might also want to talk to your doctor / meno nurse about this.