Now all the markets are crashing down and I don't know what to do with my altcoins. My briefcase fell 30% in a couple of days. I'm afraid I might lose more. Selling or hodl?
Until you are selling your alts you are not losing. Now your "loss" is only in your portfolio not in real wallet.
It's normal situation because this is market not bank deposit. The biggest mistake is to sell tokens. Now is the falling phase, in April-May can be growth. Like it was in December-January. It's impotant to keep calm currently and wait.
https://bitcointalk.org/index.php?topic=2721724