The beginning athletes and not only can come up against a situation when after the training the head is turned and feels sick. Such reaction of an organism in certain cases is quite normal and should not cause panic. Besides nausea, headaches and dizzinesses are not a reason for the termination of occupations as can confirm natural preparatory process.
Nobody will call a hiccups the pleasant phenomenon. In the course of a hiccups all body shudders, causing not only physical, but also psychological discomfort, especially if you are in society. However at all this the hiccups is useful to an organism as it allows to dump the arising loading from vagus nerve.