A diagnosis of ADHD is life-changing, it allows you to get access to University disability accommodations like extra time in exams etc.
You will also get medication (if necessary) which will change your life guaranteed because of its effectiveness at eliminating ADHD symptoms.
The only downside is the very long wait times for treatment. I suggest going to your GP asap and asking for a referral under “Right to Choose” search it on reddit. You don’t want to be put on the NHS waiting list as that is usually years long.
You may not have ADHD, but if you do a diagnosis is 100% worth it.