“上火” 有双重意思，UPSET 也有双重意思，大概可借用，尽管不 完全对应。 讲“生气、不高兴”的“上火”， upset 蛮好；但指 身体不适、口鼻生疮、腹胀脾满之类的“上火”，upset 就不敷使用 了。Upset 英语可指身体不适，但多指肠胃，同“口舌生疮”恐怕完 全没有联系，因为只有中医理论才把这一切统称为“上火”，洋人 不一定能理解。 幸亏病大多是“吃”出来的，麻、辣、烫舒服过后 那种不对劲儿也往往始于tummy，所以说 feeling upset after eating all this numbingly hot and spicy stuff 应该还可以。
I was so UPSET at first last night when they didn't invite me to the Szechuan hot-pot. But then after eating all this burning hot stuff I feel really UPSET now and I need to go to the doctor.
顺便摘一段今天从一本字典读到的解释： Facilitator: n. AmE. a person who helps an activity to go forward but does not control it: Joe and Ed are the facilitators of a men's encounter group. (Longman Dictionary of English Language & Culture, 1992)
有意思的是，本意强调no control，所以才变时髦，可现在facilitator 却有点象个euphemism，到处都用，用来掩盖实际的control或intention of control了。