Overheating and strange smell?

I work in a warehouse unloading trucks and when it’s really hot out and I’ve been working really hard, I always smell a sweet smell that’s more than likely not there. It’s hard to explain, it’s a little bit of a sweet smell but not like the smell an air freshener gives off. When it happens, my nostrils feel kind of cool in temperature.

I’m not dehydrated, I drink tons of water before, during and after work and when it happens I feel fine, I don’t feel dizzy or sick or anything. I noticed it happened back in August when i first started working here and it was hot as balls.

Is there anything to be worried or concerned about? Has it happened to anyone else and is there a term for it?