The news in term of development are actually decent, with LN getting closer to a release, so I think this is just temporary.

Yeah, this is just a temporary becase for sure a lot of good news and improvements are coming so for me stop panicking. Its green day, and I hope this is a the beginning of a new all time high in the making.
Panicking is just normal if you are a new traders because there are a lot of people today who tends to sell their coins based on their emotions since they did not know how the volatility of the market works.
The price of bitcoin depends on a number of factors.The demand and supply forces play an important role in determining the prices.When demand rises the price also rises.But now a days demand is less so prices are down.Another reason is that how much investment is done in bitcoin.Some countries have also banned bitcoin and so this has also lead to downfall of the price.Bitcoin is very volatile but people have faith in it that is why it is the leading cryptocurrency.
That's a good explanation on how the price is rapidly going down, But I think we must focus n how to recover the price of it or the money that we lost in the process of changing its price , Instead on focusing on the problem, Why not we focus on the solutions, So that the user and the investors of the coin will come up with the better idea on how to cover their profit and when will be the price of the bitcoin will recover, It is also a good opportunity for the investors they must purchase more bitcoins and Hodl it.