Long time lurker, first time poster. I made a very silly mistake of buying coin at $1160.
The short answer? Yes,
hodl. The long answer? Unless you spent the rent money to do so, just wait it out.
Woops, those answers are the same. It's not a silly mistake until you sell, and lose money. A good way to invest is buy a little bit regularly. Dollar cost averaging spreads your risk, and spreads the stress!
I don't know how old you are, but {what if} someday BTC is moonshot, and you have to tell your kids/grandkids "Yep, well, I sold my BTC way back then for only $XXXXXXXXX".
You made a non-mistake of buying coin at any price, for 2017.