I have one suggestion to make to Marco Giancotti. Please read all of Oliver Sacks books. They will help you clarify your situation a lot due to some case studies he has mentioned in his books.
Also, I think I read in one of Sacks' books that he did not have any visual imagery either?
I think it was in the chapter about himself in the "Mind's Eye" book
In one case study, a person was going progressively blind. After he became completely blind and 1-2 years later, he couldn't picture how his wife looked like in his imagination
Related : People with no internal monologue
https://www.youtube.com/watch?v=u69YSh-cFXY
https://www.youtube.com/watch?v=vqjrILPwIoo