wind is absolutely the worst, no question. I went round the lake here yesterday, headwinds going out, headwinds coming back. Someone up there hates me.
I've been over Alps, but the toughest day's cycling I ever did was out in the sticks in Northern Switzerland, flat as a pancake but 2 hours into driving wind and rain, zero cover. Utterly soul-destroying.
Toughens you up though, makes you appreciate the nice days more. Only way to treat it is like an uphill - down into your normal uphill gears/cadence and grind it out.