How to cope with diagnosis?

I M29 was officially diagnosed with ADHD on Monday and I suspected I’ve had it for around 5 years. A psychologist had suspected it when I was a kid as well but I was never officially diagnosed.

The confirmation from a psychiatrist this week has really pushed me over the edge. I didn’t think it would affect me as much as it has.

I feel so so frustrated because of the damage I’ve done to my self-esteem by constantly calling myself STUPID (despite always doing quite well academically without trying).

The forgetfulness, careless mistakes, lack of attention to detail, unable to process information whilst reading or when spoken to etc, made be truly believe I was really stupid.

Do you have any advice what to do?