Is the GBP/Britain going to be in serious trouble going forward?

[doublemore]

The GBP has dropped to massive lows, like 10% drops, its down again today, does this mean the purchasing power of the country is down 10%?  how does it work?  

Is a massive downward candle like that the same as the bitcoin market, as in if you get a huge downward candle it usually indicates a further drop incoming, also same in reverse?

Lastly does anyone have any predictions for USD to GBP value this year?