The tired effect coffee has is because your brain calms down and can rest. You just used that calmness to actually get things done. I have ADHD and coffee keeps me up for hours if I have too much. It’s definitely not a concrete rule, more just an indicator that you may have ADHD if coffee affects you differently. It’s not a concrete determining factor either way. Good luck on your diagnosis journey!

I had similar issues, the also initially thought it was thyroid issues.

Do you have allergies? Take allergy meds if you’ve noticed issues. Wash your sheets if it’s been awhile, that can make your allergies way worse than you realize. If you snore because of allergies or other reasons and don’t know it it can really fatigue you during the day, speaking from experience. When I started taking a vested interest in dealing with my allergies my energy was better.

Caffeine never really worked for me, vitamin b drops in a flavored water worked decently, and energy drinks work well. Bang works pretty good but fucks up my stomach. Monster works ok and fucks up my stomach a little less, and Ghost is my go to these days if I need one. It’s like the taurine and vitamin b in them helps more than caffeine for some reason.

Additionally, I know it’s hard, but try to make goals for yourself, essentially a “why do I want to do this, what am I working towards?” If you have an answer to that, it’s a lot easier to get motivated

I have hybrid ADHD but now that I’m older it presents itself as inattentive mostly, Adderall is great for focus for me, straterra helps my impulse control and mood regulation

A friend of mine with inattentive ADHD liked Vyvanse when he was on it

Everything is ok in moderation, if you don’t allow yourself something fatty or sweet every once in awhile, you’ll rebound way easier