I drop in pressure is generally accompanied by low oxygen levels in the air. This can cause the body to work harder to maintain normal oxygen levels in the blood aiding all kinds of physiological processes. This can be tested with an oximeter. If you use a barometer to measure the fluctuations in the air pressure and low pressure (i.e. low oxygen levels in air), you may consider oxygen therapy when the barometer falls. An oxygen pump/concentrator may temporarily raise your blood oxygen levels and counteract the lack of oxygen in the air. Periodic breathing with an oxygen concentrator should temporary raise the oxygen in the blood back to normal barometric levels at least until the barometer rises back to normal levels.