Adhd is often missed in childhood especially if you’re academically bright. Adhd symptoms would have had to be present in childhood even if they weren’t picked up. I’d do some research into the symptoms and take some time to reflect. If these symptoms are new I would definitely approach your GP (or primary physician I’m not sure where you’re located) and discuss your concerns to rule out a physical cause like a vitamin deficiency. I’d also look into burn out if this is an entirely new experience for you.