A 7-day symptom diary
A symptom diary for one week, right in your browser. Once a day, mark what bothers you, or that you feel fine, and the 24-hour change in air pressure in your city is recorded automatically. After seven days you see the week as a whole: days, symptoms and pressure side by side.
How to keep a symptom diary
Record every day, including the good ones. Memory is selective: a headache on a stormy day is remembered as proof, while a calm day without pain is never counted. An entry that says "nothing bothers me" matters as much as one with symptoms; without it there is nothing to compare against.
Record at the same time each day, for example in the evening, and don't fix past days from memory. More on how these memory errors work is in "Weather sensitivity: what the science actually says".
What a week shows, and what it doesn't
A week shows the picture: on which days you noted something and what the pressure was doing. That is enough to build the habit and see your week as a whole, but not enough to judge a link. Pressure swings don't happen every week, and a few coincidences in a row happen on their own.
If it's headaches and pressure you're curious about, what research knows is covered in "Barometric pressure and headache".
This material is informational. It does not diagnose and is not a substitute for medical advice. If symptoms are strong, getting worse or unusual for you, see a doctor.