This is happening over and over again. It is part of the game, relax, take a beer and hodl 
Exactly. Bitcoin went up so naturally, altcoins would go down. There is only so much money in this market and sometimes they do go up together in the same time but there is a chance that alts will plummet when bitcoin goes up, which is exactly what happened this time round.
Just hold whatever coin you have.
If it's a good coin, in the long term, it'll prove its worth.