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It was true she threw up in space, and it was said that Korolev wanted to bring her down early because of this. But Tereshkova has reaffirmed that this was not due to space-sickness but rather the poor quality of the space food she had been provided with. The black bread was much too dry. So she ate the few items she found palatable. She was ordered to remain strapped to her seat, evidently to combat her supposed space-sickness, but she developed a cramp in her right shin on the second day. This did not go away and became intolerable painful by the third day. To this was added a sore pressure point where the ring of her helmet pressed on her shoulder, and an itch that could not be scratched as a rash developed under one of the biomedical sensors. 

Source: http://www.astronautix.com/astros/terhkova.htm