explanation to why sp has dropped

I am sitting here is my office a very dispappointed person this afternoon and still cannot understand why the market has reacted to the news by dumping the stock. I fully expected an announcement similar to what was made and this why I did not sell prior to the announcement as I thought the SP would have shot upwards , especially as the IAEA approved the plant in terms of the most important safety aspect i.e. the radiation levels.....I have lost a huge amount of money on paper...I cannot afford to sell.so if it keeps going to lower I will be in a lot of mental pain....hope you all have a great weekend...see you later R