3) I sold my bitcoins in loss, what should I do?
This is the funniest thing 
If there were a question like this, I will answer:
enjoy your loss LOL
It's not that I don't feel empathy, but yes, what else should you do if you sell Bitcoin at a loss? Shouldn't we sell it at a loss? Why should you panic and not just hold on?
But after all, everyone has their own thoughts and also different emotional control. In this case, if panic strikes, then there is a possibility that they will choose to sell it even at a loss.
We have the opportunity to sell bitcoin when the bitcoin price reaches the highest price as we have seen before. But the problem is that a greedy factor prevents us from selling it at that price, and we still want to wait a while in the hope that the price can jump to the next high. But unfortunately, the price is not always what we want, so in this case, we better be wise in dealing with it, and we can sell it at the highest price to get a profit.