All media has it's it's own agenda, even though the claim to be unbiased. Most of the anti Brexshit stories are scaremongering and nothing more, while there may be a small truth to some things, it's blown way out of proportion. An example would be the shortage of NHS nurses; there's always been a shortage with or without Brexshit due to a lack of funding the Brexshit isn't going to have the huge impact on this that the media would have us believe.
Yes there are people stock piling but there are also people who stockpile because they think lizard people are taking over or that North Korea are about to set off nukes and there are also people who think that the earth is flat and that moon landing was faked. There's always fear mongering and conspiracies, it's just that Brexshit is a lot more visible.
It's also worth remembering that there are plenty of countries who aren't in the EU and they're doing fine and we managed perfectly well without the EU in the past and I think we'll do so again.
I'm joking when I say I'm stock piling but I might put a large bottle of whiskey aside just in case North Korea do decide to let they're nukes off...