I'm going through the same thing. I'm just really trying to find new friends who can relate to me. But it's very hard to find good friends out there

A few things: 1) Caffeine always helps me. It gives my brain the dopamine and energy I need to overcome executive dysfunction. 2) Having a set routine, and constantly making to-do lists. There are some apps you can get to help with this. This way you always know what you're supposed to do. If you enjoy the chaos of your schedule, then keep doing that, but I need the structure of having a set time to do every single thing in my life otherwise I won't get anything done bahahaha. Ofc it's not that restrictive tee hee. 3) Lots of self compassion and patience. You are neurodivergent. ADHD is a disability. Don't beat yourself up for forgetting something. Your brain is literally built differently. 4) Rewarding yourself. Find little things to reward yourself when you complete a task. Whether it's getting a drink, playing a game, whatevs. Give yourself the dopamine rush.

If fidgeting makes you anxious try a different stim like something for pressure (compression/blankets/massage/a pet) or temperature (any temp bath/shower/ice pack/hand warmers/layers) it's best to keep in mind that stimming isnt only about regulating energy but also emotion, temperature, hearing, sense of taste and smell, ect.