Hi again Wolf Tracks, to focus specifically on the issue you have regarding appointments for blood tests, I have some suggestions below which may be helpful:

1) I notice you are in the UK, me too. Sometimes it is possible to have blood taken at a walk in clinic at your local hospital, no appointment necessary. Check if this is done in your local area, if so your GP can refer you.

2) Do you have a large calender, one that you can write daily appointments in? You may want to try if not, and display in a prominent place where you can't miss it. In my home this is the kitchen. If you get confused on days you can tick off as you go.

3) Some people find a small hand held diary to write appointments in helpful, if so get in the habit of carrying it with you - in your bag if you have one, or a pocket.

There are lots of practical things you can do to cope with memory problems so whether this is temporary or permanent do not dispair. A lot of it is developing routines.