I was sleeved april 3rd and few weeks ago the same was happening to me. I thought it was the sleeve but I actually had a tummy bug which was doing the rounds in the school I worked it. Couldn't eat, didn't want to eat, constant nausea! Thankfully it passed after a few days. Def the weather is not helping, I also live in a v hot climate, but could you have some kind of tummy bug? Virus?