Thank you Hurdity - for the information and your patience - for all the explaining, my brain doesn't seem to retain the info for long

I appreciate your effort.
I think the progesterone issue came to mind as last year, when I did notice bleeding was shorter and brighter colour I read that this might be anovulatory bleeding - no follicle released and that this was due to low progesterone and sometimes if it goes on, women are given progesterone to stop the bleeding and to protect the uterus. I guess I presumed I had no follicles left (as per my Dr's assumption) and that any bleed I have will be annovulatory and really just the lining not being stable with only estrogen (?) . I guess it doesn't really matter, I think I am just struggling that things are not working anymore plus the 'alarm' factor of heavy bleeding.
No, I have never had a heavy period, all my life they just ticked along, one day light, the next 3 normal flow, only regular tampon/pad and then tailed off - 5 days regularly, cycle has always been shorter than 28, usually 26 which shortened to 22/23 in the last year.
Today the heavy flow has stopped, now just very light bleeding, it's very different than it used to be, bright red and different quality. This is the pattern of bleeding that took me to the Dr in January, a stop start flow, heavyish, then nothing, then starting again and then spotting. The swollen ankles were literally for 24 hours and it was 2 days before the bleeding started. I have always had a tendancy for a sense of water retention, generally in the stomach area, breasts, but not really the ankles.
To be honest, I think I am still not accepting my hormones are not balanced - not accepting that things won't go back to my 'normal', I think that's the root of most of my 'problem'. It's happening at a time of life where I am looking to turn a corner and for now, I seem to be wanting to 'fix' this problem before I continue. Sounds a bit bonkers, but I am pretty sure that's the main problem and I am working on just accepting and moving ahead.
I feel a bit better the flow has slowed down, it was pretty heavy yesterday, just very tearful about feeling too young and unprepared for things to have 'broken' - rationally I know that this happens and it's natural, I just feel that way today.
I have been to have my second lot of blood tests this afternoon. I have an appointment with the GP in two weeks to talk about the results and possibly HRT - he suggested this for the anxiety, I said this was my main concern - he did say he wasn't sure if it would help, but it might.
Thanks for the well wishes on symptoms - me too! It's enough for me to accept the periods ending, I know lots of people would be celebrating