whipsaw
From Longman Business Dictionarywhipsawwhip‧saw /ˈwɪpsɔː-sɒː/ verb [transitive]FINANCE be whipsawed if investments or investors are whipsawed, they are trapped in a market where prices are falling and rising very quickly, and it is difficult to say what might happenThe bond market was whipsawed in extremely volatile trading yesterday.Currency traders have been whipsawed by a combination of political crises and changing sentiments about the economic recovery.