You can feel it before it arrives — the headache building behind your eyes, the sinus pressure, the old ache in your joints — and for years everyone has told you it's in your head. Barometric Pressure Tracker shows you the pressure change before it reaches you, so you can see it coming instead of getting caught out. By the time the pain hits, you're already behind — reaching for medication, cancelling plans, pushing through a day you can't focus on. Most weather apps bury pressure three taps…