Just want to mention here that people exist wich can’t recall a memory trough mental images. It’s called aphantasia.
https://en.wikipedia.org/wiki/Aphantasia
These things are surprisingly little studied, for example aphantasia has only really seen scientific interest in the last ten years. We all seem to assume that everyone's experience is the same as ours, only slowly discovering how untrue that really is. Even something "obvious" like colour blindness in only known for about 250 years.
It works wonders for me personally to see code blocks as literal blocks that do X and connect to other blocks via graph edges. Then I pseudocode what I want and replace.
Whiteboarding is a bit difficult if I can't visualize transformations or stores of data in some way, or if I can't see a theoretical big picture for a particular function.
SDAM isn't a recognised 'condition' as such, but it has a subreddit with some active users to compare your experiences with which you may find useful.
On a related note... If you suspect that you have one of these conditions, is there someone you can talk to for confirmation? Are there people who specialize in... bad brain RAM?
That list is pretty long, I'm not sure how to feel about that. (Probably because I generally seem to have less extreme emotional reactions)
A study from May 2020 [1] seems to show a strong correlation between these symptoms, suggesting that the underlying cause may be the same.