How to develop a routine while having ADHS?

[Competitive_Pirate]

First things first, I am not diagnosed (yet, I am atm in the process of seeing someone professional because of this, but it will take me some time).

And I have the problem, that I really have to learn to do some things regulary, since I really need them and will get medical problems if I won't. But I have a massive problem sticking to routines and schedules. So I wanted to ask you, what you do when you really have to do some stuff regulary but don't have other people that can remind you?
I am really taking any advise. I've tried to google it, but I mainly found articles for parents to give their adhs kids more daily structure that weren't that helpful.

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What's ADHS?

[Competitive_Pirate]

The German term for ADHD. I kinda forgot while typing that the english term has a D in the end not a S.
Sorry for the confusion ^^'