ADHD is not something that develops over time. It is a neurodevelopmental disorder which means you are born with it. So a complete history, proper analysis of the problems you face is required for giving a diagnosis. Since you already had a diagnose, now we have to screen you for adult ADHD. In any case, you need to focus on the problems you have now and find a neuropsychologist who can help you find solutions/strategies to those problems. A diagnosis does not matter in a true sense.
Next Steps
Consult a Neuropsychologist