Are things JUST different?

Yes, I agree the word JUST can sound like trivialisation. But I think people use the word JUST too liberally, perhaps with no meaning attached. Only your wife could explain what she meant. It IS difficult being different. It IS difficult adapting, but one must. As like a man born with one arm, we work with what we have. We be our best version of ourselves. Your wife was probably trying to encourage you, and she is invaluable. She too has had to adapt to being married, as with any couple. You can bring out the best in each other. Even if you find communication hard, communicate between yourselves. Nurture that companionship. 

Rip Van Wrinkle said:

Only your wife could explain what she meant.

I think it was difficult for me because “just different” was in regards to my sensory issues especially the heat. She was after long and tiring day at work and obviously she suffered from heat as well. So she said that heat for me is not worse only different.

This is what I disagree with... I sweat so intense that I’m constantly dehydrated although I drink enough for conditions like that, my feet starts to hurt whenever temperature go above 20 Celsius, I can see spots, tinnitus goes havoc and I feel like faint ... and this is not after hard day at work. 

But how do you know it's 'worse' just because you've got more identifiable symptoms? It's like saying one person's experience of being abused is worse than somebody else's. You can't experience what your wife experiences and visa versa so there's no way of telling which one is worse. In AA, there's a common saying that if everybody threw their troubles down on the table and we're told they could take back which ever person's troubles they wanted, they would pick up their own, no matter how 'bad' they thought they were. And what are you trying to achieve by proving that your difficulties are worse than your wife's or other people's? 

But how do you know it's 'worse' just because you've got more identifiable symptoms? It's like saying one person's experience of being abused is worse than somebody else's. You can't experience what your wife experiences and visa versa so there's no way of telling which one is worse. In AA, there's a common saying that if everybody threw their troubles down on the table and we're told they could take back which ever person's troubles they wanted, they would pick up their own, no matter how 'bad' they thought they were. And what are you trying to achieve by proving that your difficulties are worse than your wife's or other people's?