I was talking to an old and now deceased friend, far to many, Austin Moorcroft, a Canadian that flew in the Battle of Britain.
He had all sorts of stories to tell, mostly not about the battles but about personal things of himself and the people he flew with/against.
The one thing that was their worst enemy was FATIGUE.
He told me FATIGUE killed more pilots during WWII than anything else. The adrenaline rushes and roller coaster come downs often clouded judgement or worse. Landings after particularly hairy conflicts proved disastrous on many occasions. This was true of all pilots, no matter which side they flew for.
He told me they would often get scrambled several time per day. They were short of pilots and some of the aircraft were barely serviceable. Often the pilots worked with their mechanics to keep them flying and just didn't report things that weren't absolutely crucial for safety so the "birds" as he called them could stay in the fight. Cockpit heaters were notorious for failing. At the upper ranges of their altitude ceilings the temps in the cockpit could be -40c. Yes, they were dressed for it but crammed into a tight seat and not moving brought on hypothermia and even more fatigue.
He told me once that he caught himself crying on the way back to the base. He kept his goggles on so no one would notice. After that, he told me he hadn't noticed that a lot of fellows kept their goggle on as well, when heading back to the debriefing shack.
I can fully understand what happens when coming of an adrenaline rush after an extended period of stress. The consequences can be lethal in so many ways.
Those were very brave men IMHO
In Arthur Bishop's (son of Billy Bishop) "Winged Combat" he reports that the electrically heated suits of the RAF frequently caught fire so they avoided using them plugged in.
The pilots also frequently (over) indulged in libations when stood down which also took a toll on physical well being.
As a kid I knew an ex-RCAF recce pilot who flew high altitude missions. He canopy hood was constantly frosted over and he saw very little. He ended up transferring to Bomber Command and flew Halifax bombers.