I'm a big dumb-azz too, Nick. If I forget my bag of crawl-goodies, I'll still take the plunge like a fool-- yeah even without a respirator

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If anything in this job is a learning experience, forgetting or not bringing the crawl-gear is a crash-course in inspecting 101. I now carry some disposable crawl coveralls (ShueBee) under the back seat of the truck for back-up.
The very worse thing any of us can do is to go splunkering under homes without the right protective equipment, i.e.; breathing apparatus, pads, clothing, pads, etc... Some of these old home have previously been treated with some pretty nasty pesticides (Chloridane comes to mind).
I feel your pain. Been there done that!
I just hope you had your respirator with you...
Rich