What to record each time
Date and time; what you felt and where; severity on a consistent 0–10 scale; how long it lasted; what you were doing beforehand; what you took or tried and whether it helped.
How often
Log when symptoms happen (events like seizures, asthma attacks or flares) plus a quick daily check-in on good days too – good days are data.
Keep it consistent
Use the same scale and the same words each time; note medication changes on the day they happen.
Turn it into something your doctor can use
Bring a one-page summary rather than weeks of raw notes – how many episodes, how severe on average, what changed, and your top two or three questions.
Paper, notes app or tracker app?
Paper works if you stick with it. A tracker app adds reminders, keeps everything dated and can export a report. WellNest does this for chronic pain, CRPS, asthma and epilepsy.