Why did it take so long to tell me I had cll

I've been told in April I have Cll leukaemia why does it take so long to be told I've had it 7 years been treated for b12 and anaemia 3 years ago having injections being told fir b12 deficiency  but was then told by the go when I changed doctors I've had leukaemia fir 7 years then got a haematology appointment a was told in April 2024 why didn't they tell me before I would if made najor life choices and the to be told it was because of covid which was 3 years ago I wounder they still had 3 years before that yes I'm lucky I've made the 5 year milestone but I've had treatments for other rmtgings not the real cause and had lots of issues including rashes pain and loss if teeth and lots of infections major hearing loss and servere vertigo ?