Regarding cognitive processing. Afraid.

I was recently diagnosed with ADHD, but I suspect I may have other challenges as well. Even after listening multiple times, I struggle to process what others say. I also find it difficult to understand things when they’re explained in a storytelling format, unlike others who grasp them easily. It takes me much longer to understand concepts compared to others. The tasks I’m working on now are things my friends accomplished 6-7 years ago. Additionally, when working on lengthy tasks, I often forget what I did earlier or fail to see the connection between my current actions and the previous steps in the same task.I often feel mentally, physically, and emotionally exhausted very quickly, and I've experienced a sense of brain fog since childhood. I need help from someone who can thoroughly diagnose any underlying disorder (APD, SLD OR MCI etc), rather than simply prescribing medication without truly listening to my concerns. Started to do PhD but feeling very very afraid.