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. 
Of course it is unpleasant, but now you definitely need to hope for a holding. Sale will not give you anything, but only even greater losses. You will have to pay for early investment time and patience.