I find it's not so much the wind...well, OK, it is...but the idiots in cars around you who see you're struggling and yet don't give you any more space than usual.
The biggest sail on the bike is the rider and so, I find lying on the tank helps. To do this and stay comfortable, I often turn my backpack round (so it's on my chest) and use it as a cushion. Slow down-but not too slow-when you're being buffeted and when the wind eases, open it up til it hits again.
Wind AND rain? Now that's evil.
