Maybe it's a sign of impending middle age, but my tolerance for this sort of irritation is getting lower and lower.
I simply keep buying more and more of whatever I keep losing until I reach the saturation point of my environment (or maybe the gremlins and pixies finally have enough) and can find what I need quickly no matter where I am.
For example, tape measures. There are at least a dozen floating around my house, garage, and vehicles. About four are "good" ones I seek out when some degree of precision is needed, most are freebies or cheapies.
#2 Phillips screwdrivers. Yes, of course I have a designated screwdriver drawer, and it's full and organized. But there are good phillips #2 screwdrivers pretty much everywhere I spend any time. I've also stopped tolerating crappy screwdrivers entirely -- the second the tip gets wonky or doesn't fit perfectly, it goes in the trash and I grab another. This policy has greatly reduced the amount of stress in my life.
10mm sockets -- yes of course I have nicely organized sets of sockets. But I also have several extra sockets in common sizes like this stashed here and there. I also make a point of stashing the less-common sizes separately. 11mm sockets go in the trash or in a special drawer of uncommon tools. My main socket rails are set up for Japanese vehicles (8, 10, 12 14, 17, 19, 21, etc.) and the other sizes used on American/Euro machinery (9, 13, 15, 16, 18, etc.) are on separate rails where I can find them on the rare occasion I need them.
Same for pencils, markers, and utility knives. They're cheap, so I keep buying more and strewing them hither and yon, and eventually there's one within arm's length at all times. A while back, I started throwing away the lower-quality utility knives whenever I find them. No point in keeping dangerous **** like that around.
Another general garage de-stresser is a large stock of spare fasteners. If I remove a Phillips head screw, it goes directly into the trash or scrap bin and is replaced with a socket head.
However, when working on a car or motorcycle, I'm very careful about FOD. I maintain awareness of what I've pulled out for the job and exactly where each piece is so I don't slam a ratchet in a hood or leave a rag in an intake.