Trying to create this app me and my dad talked about is the biggest project for me and lately it's been insanely stressful so what does everyone else do for stress management and app planning? I need help

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Playing instruments to counter the stress.

App planning (if I understood you right) can range from using a whiteboard notebook on the go, use my surface to sketch out things that need a virtual football field of mindstorming or ideas, a physical whiteboard or a chalkwall - to something as simple as ora.pm and papdesigner.

Regarding stress managment there was a rant just recently asking smth like "how do you cope with stress?" it had a lot of answers that could help you, one really interesting one was going onto the rooftop with binoculars and look up the nightsky, sounds pretty fun and relaxing.