I've noticed my worst reactions to heat are going from an A/C house right into a car that's been sitting in the sun in the summer.  My husband looks at me like I'm crazy when I start panicking to get out because I'm nauseous, can't breath and feel like I'm going to faint.  Getting into a similar car after walking around outside in the heat, I'm not happy (because my body temp doesn't regulate well) but I don't have that horrible reaction.  I think an incremental increase in something doesn't alarm the immune system the way a sudden "onslaught" does.  

Think of the old frog in a pot of water example: If you slowly increase the temp, the frog will happily sit there not noticing the difference until he's cooked, but if you put him in a pot of scalding water, he'll jump right out.  Same idea, but in our case the gradual is better!  

I believe I an a superhero and my power is SuperSmeller!! It seems like I can't handle anything with a scent. I went into the store the other day and had to put on my little mask and I had it stored in my purse next to my panty liners....Oh my goodness I thought I was going to die cause of the morning fresh scent the mask had absorbed from the panty liners! I was being accosted by a pantyliner smelling mask!
Hhah  I have to laugh sometimes!
Pam