There are various sites that show exchange rate charts for different exchanges.
I normally look at bitcoinity (
http://bitcoinity.org/markets) but tastes vary, so if you find one that suits you better then use that.
Sorry that you bought BTC when the price was higher, my advice would be to hold them at least until the price is high enough again that you can sell without a loss. Then you should decide whether you want to keep them while they are getting more valuable, or whether the risk is too high for you. But don't sell at a loss (unless you're really desperate for cash, which somewhat indicates that you invested more in BTC than you should have done).
The current exchange rate of between 350 and 400 Dollar/BTC has been more or less stable for a number of weeks. Some believe such stability is good, some would like to see much higher exchange rates. I believe it will go up sooner or later, but that will probably take some time. My bet is that we will see a new all time high in 2015, but don't depend on my gut feeling for your financial decisions!
Onkel Paul
By the way, of course exchange rate charts will only show the past, not the future. If you find one that accurately predicts the future, please tell us - most of us would even pay a bit for such information!
