From experience an NHS diagnosis take MONTHS and for some isn’t worth the wait, that being said obviously a private diagnosis isn’t always an option for everyone since they’re hella pricey and not affordable for a lot of ppl (mine was £3k). I felt I had to choose the private route cuz I needed to pattern my life ASAP, being a student at the time also facing exclusions for distractive and “self sabotaging” behaviour, and my assessment was a good six months after exams.

See your GP first and foremost and discuss your symptoms and you should get a referral.

After one month I finally asked for help

Look, it’s a squirrel!

Advice is doctor

There are a few options, and I honestly say go for all of them at once:

1. Take some (legit) self-assessments and see how they feel. E.g. https://embrace-autism.com/asrs-5/
2. Find some ADHD resources. See if the techniques and tools help, or at least feel sensible. E.g. the book How To ADHD or various Youtube channels.
3. Seek out a psychiatrist to assess you. It may or may not be ADHD, but something is bothering you that needs attention. They are usually good at figuring that out.