I have been diagnosed for almost 2 years now and there are 3 things that helped a lot to improve.

• Sleeping well, like not staying with screens until late and sleep at least 7 hours.
• Doing the good old excersice, it just works
• Go to therapy, you don't know how broken you are from ADHD symptoms until you start treating it. If you would only take one thing from my comment, please go to therapy. There is not magic solution, just working on yourself!

First off you should do black coffee instead of monster. I know it sucks but it's a zero calorie beverage. Monster is poison. I actually just last year got diagnosed and I'm on Vyvanse (highly recommend over Adderall) one thing I noticed early on with the medication, that may help you depending on what your symptoms are, I actually realized that I was more capable of breaking my attention away from things without experiencing the anxiety of feeling like I will completely forget about it, than I normally am. I'm not sure how you can simulate this without the medication before you can get yours, maybe try writing more things down or redirecting yourself? Now I've been on the meds long enough I don't really notice much of the effect anymore, but I've also noticed behaviors in myself that allow me to intervene on my ADHD symptoms without the medication every single day. I hope the medication helps you as well, and hopefully in the meantime you can get by with mindfulness tactics. I should have gotten diagnosed younger!