Let me begin to tell you that I'm not, I have never been a Summer Person. And it doesn't help living in a med country. I live in Portugal. I prefer cool places. Always have! So yes I know what you mean! I'm quite ok (as far as I can be under this condition) during the winter, I LOVE the Fall! I'm a Fall/Spring person! Summer is a roller coster of emotions, allergies, everyday headaches, denial even, for me! Usual go off to cooler places on vacation for that reason. My anxiety disorder and my depression get a lot more difficult to deal with in the summer... You're not alone!
Take care and Keep cool! :o)
Hugs,
Ana