She-Cat,
The first batch of memory issues you listed can happen to regular people under stress. The second batch...forgeting how to do things can be caused by depression.
It happened to me once when I was in my early 30s. I had always lived in a small town. When I was twenty-eight I decided to go to college, which I did..drove 45 minutes to a nice community college. Then I decided to move to the big city and go to Ohio State. Oh, wow! What a shock! My mind has always been one of those that worked like a steel trap, as they say, but the stress of moving into a huge university, and the competition in the classes just got to me, I guess. One morning I went out and got in my car and couldn't remember how to back it up! Then when I figured that out, I couldn't remember which direction to go! I was tired all the time. Would sleep between classes. I got a paper back with a D as a grade. I was stunned! I always got A s on my papers. When I looked at it, I was even more stunned because there was too many spaces between some of the words, capital letters in weird places, words spelled incorrectly, etc. AND I had proof read the paper! When to the doc who referred me to a psychologist. He told me I was clinically depressed, which I didn't really buy into, because I had never head of symptoms like that being associated with depression. But sure enough, after being on anti-depressants for a few weeks, my cognitive skills returned.
Could be lots of things. Don't know how old you are, but memory issues like those you described can also be associated with menopause. That happened to me as well. Once I ask an elderly woman if, when she was going through the change, she lost her memory. She replied, "Well, yes I did. That happens. You lose it, and then it comes back for a while and then you lose it for good"!
I tried an Ayurvedic drink that helped me alot with the menopausal memory loss. I would give you the name, but am not sure I am allowed to in a post.
Kat