i used to imagine allah...but i realized it was shirk and kufur....i want to repent but my mind keeps imagining pictures of allah please help

assalaam alykum...i am currently 13 but since i was about 4 years old i had an illness called maladaptive daydreaming it continued till i started to pray my 5 prayers about 2 months ago.. i got evil thought since i started praying till now so i turned back to allah..but the problem was that i imagine allah and i read on an article that im worshipping the image not allah swt (astaghfiruallah) i read that yesterday my heart is beating so fast i dont know what to do..i want to repent but i keep imagining allah swt.. even though i used to imagine allah..when i make dua my dua gets answered.. i am so terrified that allah is mad at me.. im terrified of allah punishment..please help..