The temperature felt like it was constantly between 110-120 degrees with the high humidity on top of that. We were advised not to wear underwear in order to avoid acquiring what they called "jungle rot". Jungle rot was a fungal condition that was fostered by constantly wet underwear and fungi mixing together in the crotch area. Without underwear, the theory was that the sweat would run down your legs and not accumulate in the groin area. Many of the guys still got it anyway.
I would not talk to any civilians about my Vietnam combat experiences for years after I returned home. As time went by, I became more open to it and will now talk to anyone that is interested.
One problem I had was in 1986 when the movie "Platoon" was released. After seeing the movie, I had a flashback while asleep and I almost hurt my wife when she got out of bed to go to the bathroom. She yelled out my name which woke me up and a potential tragedy was avoided. The other Vietnam movies, "Full Metal Jacket", "Hamburger Hill", and "Born on the Fourth of July" did not have the same effect. The other Vietnam movie that I was really moved by was Mel Gibson's "We Were Soldiers".
I thank you for asking.