I've been suffering short time depression and tiredness over 20 years. It lasts from couple of days to about 10 days. I had no idea, what caused that. I started to keep notes of my diet and feelings last year. No match. Then I found a weather station history data. MATCH! Every time, when pressure drops down quite a fast, under 1005, that's it. Tired and depressed.

But what is the mechanism? Blood pressure? Ear? Sinus?