During the last week I bought coins and they almost immediately fell by 10-15%, and today early in the morning I saw how they fell by another 15-20%. How long will it last?., and whether I should sell for what I have. I wouldn't want to be left with empty pockets. 
if you sell it because of panic it will get a big loss again and I am sure you do not want this one that makes hat = it can skyrocket down because FUD has excessive panic due to the news about crypto